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FROM THE TERTIARY OF VIRGINIA. 241 
growing for awhile, and some are minutely wrinkled. The cicatrices are deep and well 
defined. The whole shell is remarkably globose. 
This species agrees pretty well with the description of S. trisulcata, Conrad, but that 
shell is said to be “obovate,” while ours is very rotund. It is also closely allied to some 
of its congeners from Claiborne. 
FAMILY CONCHID.%. 
GENUS ASTARTE. 
A. tinroLata, PL. 34. Fie. 20. 
A, testé triangulari, pene equilaterali, inflatd, crassd, striatd; striis crebrissimis, rotundatis, concentricis; margine basali 
sub-curvato; natibus elevatis, acwminatis; lunuld valde elongata; dentibus magnis, valde divergentibus; mar gine interno crenulato. 
Shell triangular, almost equilateral, inflated, thick, striate; striae concentric, very numerous, rounded; basal margin 
somewhat curved; beaks elevated, acuminate; lunule much elongated; teeth large, very divergent; internal margin 
crenulate. 
Diam, .15. Length .18, Breadth .21. of an inch. 
Remarks.—The strive are very regular, minute, and about fifty in number, on a full- 
grown specimen now before me. ‘The lunule is unusually long and rather broad. The 
beaks are elevated and produced. 
I, at first, regarded this as a young specimen of A. concentrica, Conrad, but the 
crenulations on the inner margin prove it to be full-grown. In size it approaches the A. 
lunulata, Con., but the striae are much smaller and more numerous, and the shell is 
more inflated, 
GENUS CYTHEREA, 
C. eLevata, Pu. 34. Fic. 21. 
C, testé ovata, transversd, inequilaterali, posticé sublruncatd, antice rotundato-angulatd, inflatd, crassa, nitente, substriatd; 
sirtis concentricis, minimis, medio obsoletis; margine basali curvato; margine dorsali angulato; natibus elevatis, prominentibus; 
dentibus magnis, quorum uno bifido. 
Shell transverse, ovate, inequilateral, subtruncate posteriorly, rounded-angular anteriorly, inflated, thick, shining, 
substriate; strie concentric, very small, obsolete in the middle} basal margin curved; dorsal margin angular; beaks 
elevated, prominent; teeth large, one bifid. 
Diam. .19. Length .28, Breadth .32 of an inch. 
Remarks.—There are no very decided characters about this shell, yet I cannot refer it 
to any known species. When young, its form is more longitudinal, It is more allied to 
C. convexa, Say; than to any other shell. 
C. spumrica, Pui. 34. Fie. 22, 
C. testd rotundd, equilaterali, globosd, tenui, levi, polité; margine dorsali curvato; natibus elevatis, prominentibus, rectis 
? ? ? ? oP > a J »P 
lunuld minima, lanceolata; dentibus parvis. 
Shell rotund, equilateral, globose, thin, smooth, polished ; dorsal margin curved ; beaks elevated, prominent, straight; 
lunule very small, lanceolate; teeth small. 
Diam. .18, : Length .19. Breadth .20 of an inch, 
VOL. 1X.—64 
