242 NEW FOSSIL SHELLS 
Remarks.—This shell is rounded and more globose than any of its congeners that 
I have seen. These characters will serve to distinguish it from all our other fossil 
species. 
GENUS VENUS. 
V. ascia, Pu. 34. Fie. 23. 
V. testé longitudinali, oblique triengulari, sub-inequilaterali, postice et anticée sub-angulatd, compressa, crassd, striatd; striis 
concentricis raris; margine basalt minime curvato; margine dorsali angulato; natibus prominentibus, acutis; dentibus tribus 
divergentibus; cicatrice palleali acute sinuata; lunuld magnd, elevatd, lined impressd marginatd. 
Shell longitudinal, obliquely triangular, sub-inequilatera], somewhat angular posteriorly and anteriorly, compressed, 
thick, striate; strie concentric, few; basal. margin slightly curved; dorsal margin angular; beaks prominent, acute; 
teeth three, diverging; palleal impression acutely sinuate; lunule large, elevated, margined with an impressed line. 
Diam. .15. Length .30. Breadth .31 of an inch, 
Remarks.—The surface is somewhat rugulose with irregular lines of growth, which, 
in two or three places, amount almost to ribs. The general outline is that of a triangle 
with slightly curved sides. 
This shell has an unusual shape for a Venus, but the three distinct cardinal teeth will 
not admit it into any other genus. Although the sinus of the palleal impression is deep 
and acute, it has not the circular outline of the Artemis. 
FAMILY CARDITD/. 
GENUS HIATELLA. 
H. tancea, Pui. 34. Fic. 24, 
H. testé tronsversissimd, inequilaterali, posticé et anticé truncato rotundatd, minime hiante, valdé compressd, concentricé 
striald; striis minimis; clivo umboniali elevato; margine basali recto; margine dorsal. medio sub angulato, postice et anticé recto; 
natibus prominentibus; dentibus magms. 
Shell very transverse, inequilateral, truncately rounded posteriorly and anteriorly, gaping very slightly, very much 
compressed, concentrically striate; strie very small; umbonial slope elevated; basal margin straight ; dorsal margin 
sub-angular in the middle, straight posteriorly and anteriorly; beaks prominent; teeth large. 
Diam. 10. Length .15. Breadth .29 of an inch. 
Remarks.—The lines of growth are very small and inconspicuous. The two teeth in 
the left valve diverge considerably. The anterior one is bifid. 
This genus is placed in the family Cardiide by Lamarck, and in the Lithophagide by 
Sowerby, who does not regard it as distinct from Saxicava. Which is right, I have no 
means of determining, and I therefore leave it where Lamarck places it. 
FAMILY ARCACID/. 
GENUS NUCULA. 
N. poLABELLA, Pu. 34, Fic. 25, 
N. testa oblique triangulari, mequilaterali, postice et antice angulatd, inflatd, crassiusculd, striatd; striis concentricis, 
minutissimis; striis longitudinalibus, pene obsoletis, raris, clivo wmboniali precipiti; margine basali curvato; margine dorsali 
medio acute angulato, postice et antice recto; dentibus parvis; cochled parvd, sub triangulari; margine interno crenulato. 
