The other specimens of this genus are characteristic of relatively deep water in the present oceans. No further specimens of this species were found in a further search of the Trinidad Cretaceous.
ART. 14 FORAMINIFEEA FROM TRINIDAD — CUSHMAN AND JAEVIS 13
The figured specimen shows fairly well the characters of this species described by Alth from the Upper Cretaceous of Europe. AST.14 FOEAMINIFERA OF TRINIDAD CUSHMAN AND JARVIS 15This species, originally described from the Velasco Shale of Mexico.
AST. 14 FOEAMINIFERA FROM TRINIDAD CUSHMAN AND JARVIS 15 This species, originally described from the Velasco shale of Mexico
This is a common species in the European Cretaceous and is found both in the Trinidad collections and in those of the general Coastal region of the United States. It differs from Tritaxia ti'icaHnata in the much greater increase in diameter towards the apertural margin, that of the T-type.
AET. 14 FOEAMINIFEEA FROM TRINIDAD — CUSHMAN AND JARVIS 17
Test different from typical stouter shape, early part more pyramidal than type; periphery, instead of rounded and convex, slightly concave. Widely distributed in the Upper Cretaceous of the Gulf Coastal Plain of the United States.
ART. 14 FOKAMINIFERA PEOM TRINIDAD — CUSHMAN AND JARVIS 19
This variety is very common in the Trinidad material .. but is not well developed in the Upper Cretaceous of the United States. Test differing from the typical one in the broader, almost circular shape and the much more prominent appearance of the last whorl, forming almost a rounded carina around the periphery.
ART. 14 FORAMINIFERA FEOM TRINIDAD CUSHMAN AND JARVIS 21 Family TROCHAMMINIDAE
There is a supplementary cleft in the median line of the apertural face, placing this species in the genus Rohulus^ as it were. This species is also widespread in the Coastal Plain region of the United States in the Upper Cretaceous.
ABT. 14 FOEAMINIFERA FROM TRINIDAD — CUSHMAN AND JAKVIS 25
The specimen figured is unusual, showing a great irregularity in the overlapping of the chambers, producing an unusual arrangement of the sutures externally. The megalospheric form has fewer chambers and the early part often consists mainly of the spherical prolocu-. This is a very common Cretaceous species occurring in Europe and America, already known from the Velasco Shale of Mexico and from the Cretaceous of California.
Test elongated, early part compressed, and chambers close coiled, later being unrolled; periphery acute and chilled in the early part; later chambers almost circular in section; sew more. Common in the Cretaceous of Europe, this species has only been recorded in America from the Cretaceous of California. Our specimens from Trinidad are somewhat more inflated, especially in the later chambers, but the general character of the species is fairly constant.
Raised stitches vary somewhat in degree of thickening, but this character is usually present to a considerable extent. Species of this species were described by d'Orbigny from the Cretaceous Cretaceous of the Paris Basin, and it is quite widely distributed in the Cretaceous phase of the Upper Cretaceous of Europe and America.
ABT. 14 FOBAMINIFERA FROM TRINIDAD CUSHMAN AND JARVIS 29
The specimen is elongate, slightly tapering, the early part often somewhat compressed; later chambers become inflated and distinct; sutures depressed, especially in the later part; wall ornamented by numerous rather coarse longitudinal costae, especially those of the early part, continuous over adjacent chambers and often some. The broken specimen figured has very rough costae, which project. somewhat at the base of each chamber and in the later chambers are projected as short spines. Test elongate, slightly curved; chambers gradually increasing in length as they are added, until the last chamber is often twice as long as wide; sutures distinct, slightly depressed in the later part; wall smooth ; aperture terminal, radiating, very slightly projecting.
This species was originally described by d'Orbigny from the Cretaceous of the Paris Basin and has been recorded very widely from Europe and elsewhere. It is a common species in Trinidad and. in the Upper Cretaceous of the Gulf Coastal Plain of the United. Test elongate, composed of a pair of very inflated, subglobose combs. bers becoming slightly longer than wide in the later chambers, the base often with a slight spine; sutures strongly depressed; wall smooth; aperture terminal, radiating, very slightly projecting.
This species has been widely recorded in the Cretaceous of Europe, occurs in the Cretaceous of Trinidad, and is probably widespread in America. Description.—^A variant differing from the typical in the shape of the chambers, which are somewhat conical, the greatest width almost at the base of the basal part, the angle very strongly truncated.
AET. 14 FORAMINIFEEA FROM TRINIDAD — CUSHMAN AND JARVIS 33
34 PEOCEDINGS OF THE NATIONAL MUSEUM vol.80 may not represent a single species, but they are characterized by subglobular chambers and numerous costae, which are continuous from chamber to chamber. Test elongate, variable in shape in microspheric and megalospheric forms, the first with many chambers and constrictions, the greatest width near the edge of the opening, the second with chambers of almost uniform diameter throughout; chambers distinct, inflated, especially towards apertural end, initial end usually with a stout spine; sutures distinct, depressed, often somewhat faint; wall ornamented by numerous longitudinal ribs (usually 13 to 15), continuous over adjacent chambers, usually sharp and plate-like;. It is very close to a figure given by Franke from the Cretaceous of Germany.^° Very similar examples also occur in Ve-.
ART. 14 FORAMINIFEEA FROM TEINIDAD CUSHMAK AND JARVIS 35 NODOSARIA BREVITESTA Franke
36 PROCEEDINGS OF THE NATIONAL MUSEUM vol.80 The figural form closely agrees with the species described by Eeiiss from the Cretaceous of Europe. The figured specimen may refer to Marsson's species described from the Cretaceous of Kiigen Island. It is conjectured that it may be merely a form of the preceding species, but more material is needed to establish this point definitively.
No further material has been found that can help resolve the problem of the identity of this species. This form, in which the body of the test is covered by longitudinal costae, appears to be identical to a similar form already recorded in the Velasco Shale of Mexico. The specimen depicted may be referred to this Cretaceous species. The specimen depicted may be referred to this Cretaceous species. which is variable in the shape of the rooms.
Beiimrhs.—This is an unusual, highly ornamented species. genus, and is very different from any other Cretaceous Imown form. is named after the late prof. Yoshiaki Ozawa who contributed to this. as far as this family is aware. It has highly finished sutures and an unusual arrangement of the umbilical region with a thickening of the transparent shell material pierced by irregularly curved tubular openings.
AET. 14 FORAMINIFEEA FEOM TRINIDAD CUSHMAN AND JARVIS 43
The ornamentation of this species is very distinct and will distinguish it from all described species of the genus. This species is now generally known from the Cretaceous of the Western Hemisphere and occurs in its typical form in Navarre and its equivalent in the Gulf Coastal Plain region of the United States. Testa slightly fusiform, nearly circular in cross-section, greatest diameter towards end of aperture, margin very slightly, if at all, lobulate, composed of a few chambers; sutures distinct but not indented; costum smooth, finely perforated; aperture at.
ABT. 14 FOEAMINIFEEA FROM TEINIDAD CUSHMAN AND JAKVIS 45
The figured specimen, although somewhat more open in its coiling than is usual in this species, may possibly be included in its range of variation. Test very compressed, trochoid, biconvex, dorsal side often almost flat, periphery rounded, umbilicus often open; chambers numerous, 10 to 12 in the last formed whorl, distinct; sutures distinct,.
ART. 14 FORAMINIFERA FROM TRINIDAD CUSHMAN AND JAEVIS 47
Test plano-convex, ventral side very strongly convex, dorsal side flattened or even slightly concave, except in the center, which is slightly raised, periphery strongly curved and developing a flat carina. Test triserial, consisting of an early conical part and a later inflated part consisting of the last three chambers in adults; cham-. This is a very special small society, but it has a very wide distribution in the Upper Cretaceous of Europe and America.
Test planispiral in the adult, completely involute, compressed, peripherally rounded; chambers typically five in the last formed coil,. This appears to be a widely distributed form in the American Cretaceous, it is recorded from the Velasco Shale of Mexico and also occurs in Trinidad. Rare specimens of this genus occur in the Trinidad Cretaceous, but specimens are not in sufficient number and completeness to give full character for specific determination.
ART. 14 FOBAMINIPERA FROM TRINIDAD — CUSHMAN AND JARVIS 51
Test closely coiled, the dorsal side slightly convex, the ventral side slightly concave, the periphery broadly rounded, 9 or 10 chambers in the last formed spiral, rather indistinct, as are the sutures, clearer in the last few chambers. The dorsal side with a very coarsely punctured wall; the ventral side, especially in the earlier part, with very large, depressed areas of irregular shape, giving that part of the test a special appearance; opening along the ventral edge. As far as our material from both areas shows, the species has not evolved sufficiently to warrant placement in the genus Planulina. The accompanying figures are of a specimen typical of a Trinidadian species and appears identical to that of von Hagenow as shown.
It is strongly compressed, has many chambers, and becomes slightly developed on both sides in the adult. Test strongly compressed, evolved, periphery subacute, both sides slightly umbonate; chambers distinct, numerous, uniform in shape. 14 FOEAMINIFERA FROM TRINIDAD CUSHMAN AKD JARVIS 53gradually increasing in size as added; sutures distinct, curved, terminal, gradually increasing as they are added; sutures pronounced, curved, rounded.
The specimen depicted appears to have characters similar to those described by Reuss^^ of Europe as "Rotalia involida^'' and witli.
EXPLANATION OF PLATES
AUT. 14 FOEAMIXIFERA FROM TRINIDAD CUSHMAN AND JARVIS 57 Plate 7
ART. 14 FOEAMINIPERA FROM TRINIDAD — CUSHMAN AND JARVIS 59
S NATIONAL MUSEUM PROCEEDINGS. VOL 80, ART 14 PL 1
