The outside of the expanded wings, the base and the columella are marked by more or less equal and equally spaced spiral lirations. On the first three vertebrae, these axial ribs are quite regular, being strongest in the center of the whorls and tapering toward the apex and periphery. The stromboid notch at the anterior end of the outer lip is .. rather short and shallow; the space between the stromboid notch and the basal canal is claw-like.
The body of the whorls is characterized by fine spiral lirations, while the columella has strong spiral cords. Of the axial ribs, 10 occur on the first six whorls, 12 on the seventh and the last whorl. There is a heavy varix about one-sixth of a turn behind the edge of the outer lip.
Shell rather fusiform in appearance with the opening almost equal to the rest of the shell and a strong, deeply incised sinus on the summit of the whorls. Postnuclear whorls with a pair of strong knob-like ribs, extending from the anterior limit of the sutural sinus to the periphery. Post-nuclear whorls strongly rounded, marked by almost knob-like axial ribs, extending from the anterior limit of the posterior sinus to the periphery.
8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I ture consists of fine threads, which in the sinus portion near the
Wood, in 1818, in his "IndexTestaceologicus," on page 125, names this species Murex virgo, referring to Lamarck's figure quoted above. The shell is rather large, fusiform, pale brown, except for the large median keel between apex and suture and a broad area extending over a little more than half of the posterior part of the columella, which are white. The tops of the other spiral coolers are also a little paler than the spaces between them.
These are followed by about half a turn traversed by about 10 slightly attractively curved axial ribs, which are about one-fourth the width of the spaces separating them. In front of the stipe, there are on each roll two additional keels, one, the stronger, occupying the periphery of the rolls, the other a little closer to the second stout than the peripheral one, and a little weaker than the peripheral one. The spaces between the keels are distinctly concave, and they are traversed by thin, axial ribs, which are retractively curved behind the strong keel and protractively curved in front of it.
This also applies to the continuation of the axial sculpture, which also becomes weakened and outdated.
10 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I Apertui'e narrow and long, the outer lip deeply incised to form the
2 NEW TURRITID MOLLUSCS BARTSCH II slender, closely spaced, axial ribs, which are retractively oblique behind the strong keel and protractive in front of it. The columella is long and slender, and marked by rather regularly spaced spiral threads which extend to the entire apex, and which gradually become weaker from the base anteriorly. The axial sculpture on the base is almost as strong as on the spire, while on the columella it becomes decidedly weakened and disappears towards the tip.
The inner lip is pressed against the columella as a callus and this callus extends over the parietal wall. Nuclear whorls 1.7, the first smooth and well rounded, the second with weak submedian angulation.
12 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. QI which are ahnost median on the whorls and evanesce at the sutural
Shell of medium size, fusiform, pale horn-colored, with the spaces light chestnut brown and with a pale chestnut brown central basal band and the tip of the columella of the same color Nuclear whorls 1.5, smooth, well rounded. A pair of closely spaced wrinkles mark the transition of the nuclear whorls to the postnuclear whorls. On the other, this cord tends to split and thence develops into two nodule cords, the nodules representing the axial ribs.
Nodules on the first postnuclear whorl are point-like, whereas in subsequent whorls the nodules become increasingly rounded and elongated, their long axes corresponding to the spiral sculpture. Of these nodes, 10 occur in the first second round, 12 in the third and fourth, 14 in the fifth and sixth and 16 in the seventh and last round. In front of the two nodulose spiral strands, the whorls are marked with four almost equal spiral strands.
The entire base and front of the whorls are also traversed by rather thick lines of growth, which are especially pronounced between the spiral cords. Aperture very elongate, distinctly channeled anteriorly, and with a very incised sinus immediately below the apex.
14 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I
NO. 2 NEW TURRITID MOLLUSKS BARTSCH I 5 ened into a decided denticle opposite the posterior termination of the
Anterior to the sinal groove, three spiral threads are present on the first and second of the postnuclear whorls, and five of the remaining whorls except the last, which has six. Here too an extra slender spiral thread is present between the first second and the second and third of the strong threads. The base is moderately long, characterized by the slender axial ribs described above, which disappear slightly anterior to the middle, and 21 spiral threads, which are of almost equal strength and mutual distance, although the last three tips of the columella are less strong and slightly closer each other.
Outer lip strengthened by a strong varicose vein, from which the edge of the lip protrudes like a claw-like element curved inward. Early postnuclear whorls are somewhat worn, but remain characterized by broad, stout, slightly retracting axial ribs, approximately as wide as the spaces they separate, disappearing at the sulcus immediately below the apex and also gradually disappearing at the base . On the sinus below the apex, the axial sculpture consists of numerous rather closely spaced arcuate ribs.
NO. 2 NEW TURRITID MOLLUSKS BARTSCH I7 passing over the axial ribs render these nodulose, the long axes of the
Clean posterior whorls moderately well rounded, marked by somewhat oblique, retractile axial ribs, of which 12 occur on the first, second, and third, 14 on the fourth, 16 on the fifth, 18 on the sixth and 20 in the last roll. In addition, the vortices are marked by rather strong spiral chords, of which one occurs in the first, two in the second and third, three in the fourth, and four in the remaining turns, except the last, which has five. In addition, the entire surface of the axial ribs and intercostal spaces are marked with growth lines.
Columella rather long, moderately stout, marked with 17 spiral cords and threads which grow progressively weaker anteriorly, the last six very faintly marked. In addition to these spiral cords, the entire surface of the spire and base is marked with close-fitting microscopic spiral stripes. In addition to the spiral sculpture, the whorls are marked with axial ribs, which have their beginnings in the nodulose spiral thread of the first.
They extend but very slightly posterior to the posterior sulcus, and disappear anteriorly at the base of the last whorl. These ribs and the spaces that separate them are marked by growth lines, which also extend across the posterior sulcus and across the base and columella, giving the general surface a finely reticulated cloth-like sculpture. Base well rounded, marked by four strong nodulous spiral cords like the spiral and the intervening spiral threads.
Columella rather long, twisted, with a vague indication of an umbilicus at its apex, marked by seven strong spiral cords, broad, rounded, very nodular and. In addition to these spiral cords, the cords themselves and the spaces between them are marked with strong spiral threads. Columella moderately long, slightly curved and marked by nine strong spiral cords, between and above which thin spiral filaments are present.
The first half-core bend is well rounded and smooth, the last half is characterized by a pair of fairly widely spaced, slightly protractively inclined axial ribs. Post-nuclear whorls well rounded, the first marked by three slender spiral cords, the anterior two of which increase in size more rapidly than the first, which remains rather weak.
22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I marked by a smooth spiral cord representing the portion appressed
On the successive whorls, these cusps are elongated into ribs that extend from the sinal sulcus at the apex toward the suture, becoming weaker toward the suture. Columella short and blunt with a strong, broad fold opposite the varix on the outer lip. Aperture short, distinctly channeled anteriorly and posteriorly, the posterior canal deeply notched and on the summit of the shell.
Postnuclear whorls moderately well-rounded with strongly developed axial ribs, which begin weakly at apex of whorls and become strongest at about anterior end of posterior third, again gradually weakened on base and disappearing on columella. On the first post-nuclear whorl these ribs are pointed; on the later ones they stay. In addition to the axial ribs, the whorls are marked with fine incremental lines on the spire as well as on the base.
Spiral sculpture is absent on the spire and base and present on the short stout columella, which. 9Iing; remaining vertebrae with transverse, strong shoulder ribs (on the last ing; remaining vertebrae with transverse, strong, shoulder ribs (on the last . eleven vertebrae) obsolete anteriorly and followed by a few (four or five) rotating ribs at the anterior end of the canal, suture pressed together These ribs grow gradually longer on the succeeding whorls, and in the last whorl they extend across the base to the columella.
There are 10 on the first and second postnuclear whorls, 12 on the third through sixth, and 16 on the last. They are crossed at the apex by slender, spiral threads, which are confined to the anterior two-thirds of the turns between the apex and the suture. Diaphragm moderately long and rather broad, decidedly channeled at the posterior angle of the aperture and also anteriorly; outer lip thin, decidedly canaliculated at the posterior angle, and stretched between the canal and its anterior limit; inner lip reflected over the columella and compressed as a thick callus extending up over the parietal wall, where it forms a knob near the posterior corner of the aperture.
This species is closely related to Syntomadrillia woodringi, from which it can be immediately distinguished by its much sturdier and less spiral cords on the columella and by its slimmer core whorls. The spiral image consists of well-incised lines anterior to the posterior sinus, no spiral image is noted on the latter.
NO. 2 NEW TURRITID MOLLUSKS BARTSCH 29
NEW MOLLUSKS OF THE FAMILY TURRITIDAE
NEW MOULUSKS OF THE FAMILY TURRITIDAE
NEW MOUUUSKS OF THE FAMILY TURRITIDAE
