GT7PPY— MOILUSEA FEOM CUM AS" A. 
91 
is very interesting. Among the recent shells are several 
which are by no means common in the Westindies; as for 
instance the trne Persona reticularis (Linn.) which though 
nearly allied to must not he confounded with the P. cla - 
thrata of Madagascar nor with the fossil P. similima of the 
Westindian Miocene. Pispacus glabratus occurs at Cumana : 
and I have also from that place an undetermined species 
of Fusus (which resembles young shells of Fasciolaria 
gigantea except that it has a longer canal), and also the 
following : Solarium tesselatum , Phos guadelupensis , Venus 
jlexuosa , Calyptraea auriculata , (of which apparently there 
is a good figure in the large edition of Cuvier’s Eegne 
Animal pi, 48, f. 4, under the name of (7. cuvieri Desh.) 
Oliva reticularis (several forms), and 0. monilifera Eeeve 
(? = 0. mutica Bay = nitidula ), 
Venus superla n. sp. PI. III. f. 
Ovate, slightly subtrigonal, a little inequilateral, ven- 
tricose ; anteriorly produced and rounded ; posteriorly 
produced and subangulate ; umbones closely approximate ; 
iunule large, striated with irregular diverging lamellae, 
distinctly defined by a sharp groove : posterior dorsal 
area large, striate, not distinctly defined. Valves marked 
with numerous irregular angulate streaks of chesnut or 
brown and adorned with numerous concentric crenate ribs, 
which are rather more distant, thinner, and more distinctly 
crenate near the anterior and posterior margins: on the 
disk the ribs are square, flattened and polished, and the 
crenation is less marked. Length 70, height 55, thickness 
about 45 mm. 
Mactra anserina n. sp. PI, III. f. 
Oval, compressed, subequilateral, gaping widely pos- 
teriorly, anteriorly somewhat produced and subangular, 
