193 
Ohs. This is a small species, and the slight irregularity in the 
curvature of the lateral edge, exhibits the unequivocal characters 
of this genus. PI. 38. 
Bullina. — Shell cylindrical-oval, convolute, imperforate ; spire 
elevated, short; aperture longitudinal, elongated, much narrowed 
above; labrum simple, gradually much more prominent in the 
middle than at the extremities, meeting the preceding volution 
with a deeply re-entering angle; at base widely and regularly 
rounded ; columella with a slight fold. 
Ohs. Blainville quotes Ferussac for this genus, which, perhaps 
inadvertently, he calls Buline^ with one 1, instead of Bullina as the 
latter author writes the word. He has, however, considerably 
limited the group by assigning to it the character of fortement 
involvees,'" spire visible et saillante a Fexterieur ; Foverture tres 
etroite en arriere,’’ which excludes some of the species compre- 
hended by Ferussac. He also places it as a subgenus under Bulla., 
with la Bulle, la Jonkaire,’^ of Basterot, as its type. The ani- 
mal differs from those of the genera Bulla, Scaphander and Atys, 
by having two distinct tentacula, and from Bullea by being in- 
cluded within the shell. The shell differs by its prominent spire, 
which in those genera, when it exists at all, is umbilicated. 
In its general form and habit it has much resemblance to Vol- 
varia ; but the shells of that genus are emarginate at base. 
Bullina canaliculata. — Volvaria canaliculata, noh. Jour. 
Acad. Nat. Sc. vol. 5, p. 211. 
Ohs. This genus has been constructed subsequently to the pub- 
lication of my description of the above species. 
In comparison with a fossil shell of Hax, sent to me by Mr. 
Hoeninghaus of Crefeld under the name of B. lajonTceiriana, 
Baster., before mentioned, it is a little larger, and evidently dif- 
ferent in having the shoulder grooved ; whereas in that species the 
shoulder is acute and the suture is profoundly impressed. PI. 39. 
Cardita. — Shell equivalved, inequilateral, thick, suborbicular, 
free, regular, ribbed, the margin crenate ; epidermis distinct ; hinge 
of two teeth, one of which is short, direct, and the other oblique, 
elongated in one valve, and in the other valve, is a large cardinal 
recipient cavity with an oblique tooth on each side of it, nearly 
parallel with the margin ; ligament sub exterior ; two obvious mus- 
cular impressions united by an arquated, entire palleal line. 
