On some new species of Eocene Mollusca from the southern United States

PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 149

Analfin,distancefromsnout _4.7

Caudal, length 18

Pectoral,length 24

Ventral, length ₁₇

Finrays

:

Dorsal XXXII

Anal _II,-20

Scalesin lateral line 38

The

specimens have been presented to the United States J>rational

Museum.

San Diego,

Cal., April 10, 1880.

OTSSOITIE

ISEW SPECIES OF EOCEIVE

MOL.L1JSCA

FROM THE

SOITTIS- EBIV UIVITED

STATES.

By AWGELO IIEII.PR1^.

A

^{part ofthespecieshereindescribed have been}for severalpast years

among

the collectionsof the United States National

Museum.

Those which arementionedas coming from Texas were collected

by

Mr. G.

W\

Marnoch,

who

sent

them some

years agotoDr. C. A. White,

and

were

by

the lattergentlemanpresentedtothe National

Museum. The num-

ber following thedescriptionof each species is that by whichit isre-

cordedinthe

museum

register.

PLEUEOTOMA, Lam.

Pletjeotoma pagoda,

n. sp.

Plate, fig.1.

Yentricose; whorlsaboutnine, thebody-whorlnodulatedon itsmost convex portion (nearlycentral), the nodulation consisting of a single seriesof sharp, obtusely-pointed,

and

flattened spines ornodes, which frequentlyappeardouble

by

the crossing of

an

impressedlineovertheir basalportion; uppervolutions witha similarseriesof nodesalmostim- mediatelyabovethesuturalline,

and

graduallydwindlingoffintoacren- ulation; upi)er surfaceof thewhorls concave,faintlystriated,thesinual rugsB indicating but a faint sinus; lower surfacewithnumerous well- developed revolving lines, which

show

atendencyto alternate. Aper- tureexceeding the spire in length, considerably contractedat aboutits center.

Length, _1^inch. (No. 1505.) Eoceneof Alabama.

This speciesinits generalappearance greatlyresemblescertainforms of Fusus,

and

a comparisonof

more numerous

specimens

may show

it tobelong tothat genus, althoughthe ornamentationof the whorls, as well as the sinual indication,

more

clearly point to Pleurotoma.

The

loO PEOCEEDIXGS OF UNITED STATES XATIOXAL MUSEUM.

onlytwo specimensinthecollectionliave tlie outer lip fractured,

and

I

am

therefore unable to pronounce conclusively

upon

thepreseuce ofa true notch.

PLEUK0T03IA VENUSTA,

U. sp.

Plate,lig.2.

Slender,acuminate^; whorlsaboutnine,convex,ornamented

by

numer- ous tinerevolvinglines, which on tht? body-whorlare disposedinjiairs;

cuedeeplyimpressed linemargins the majority of the volutionsimme- diatelybelowthe suture: sinnatedlinesof growthnotprominent; spu'e

and

aperture of about equal length.

Length, l-^inch. (So. 1509.) Jackson, Miss.

Pleueotoma platysoma,

n. sp.

Plate,fig. 3.

Whorls

^'?in number, flattened, eachvolution following the otheral-

most

indirect continuation without

any

prominentsutural division,

and

ornamented with

immerous

revolvinglines, which onthecaudal portion of the body-whorl tend to alternate,afinelineinterposingitselfbetween the

more

i)romiueut ones^; apertureprobablyaUttle

more

thanone-third the length of theentire shell^; notch deep, sigmoidal.

Length, 2 inches? (No. 891G.) Atascosa County,Texas.

EUCHEILODON,

Gabb.

EUCHETLODON CRENO-CAEINATA,

n. Sp.

Plate, fig. 4.

TVhorls subscalariform, flattened above, the angulation formed

by

a doublycrenulated carina; volutionsornamented

by

nunun-ousrevolving, profoundly elevated strife, whicharedecussated

by

the

much

finersinn- ated linesof growth; the upperor flattenedportion with a inxmiineut beaded line bordering the suture,

and two

(afiner

and

a coarserline) intermediate ones between the

same and

the cariua; outerlip grooved within,

and

i)robably sharply creuulated

by

the terminations of there- volving stricTB; columella with about eleven beads, which decrease in size from above downwards. Aperture nearly equalinlengthto the spire?

Length

of fragment, 1 inch. (No. 8921.) Jackson, Miss.

SCALAEIA, Lam.

SCALAKIA

UNILINEATA, U. Sp.

Plate,fig. 5.

Whorls

about nine in number, convex, with

numerous

very ^faint, almostinvisible, revolvinglines,

and much more

prominent transverse