124 
are thirteen or fourteen in number, extending from the suture 
about half the distance to the tip of the beak, and near the suture 
exhibiting a tendency to rise into arched scales ; the whole surface 
of this shell is sculptured with small revolving grooves, to the num- 
ber of from twenty-five to thirty on the body whorl ; inferior 
moiety of the body whorl tinged with rufous ; suture profoundly 
impressed ; aperture gradually diminishing to the beak ; strise of 
the labrum within distinct, sometimes obsolete or wanting. 
Length nine-twentieths ; greatest breadth more than one-fourtli 
of an inch. Inhabits the Southern coast of East Florida. 
The aperture is not suddenly contracted at the origin of the 
beak channel, as in many species, but is gradually diminished in 
width, much like Montfort’s figure of Latirus filosus. 
For this shell I am indebted to Mr. Elliott. 
Patella alternata. — Shell conical, with upwards of thirty 
obsolete, hardly raised, unequal ribs ; apex obliquely curved, the 
tip pointing nearly in a parallel direction with the surface of the 
shell, and acute ] color brown, radiated with white ; base oval. 
Basal length three-tenths of an inch. Inhabits the Southern 
coast of East Florida. 
Communicated by Mr. Elliott. It seems to approach the leuco- 
pleura, as described by authors, excepting that the base is not 
ovate, as the base of that shell is said to be. 
Calyptr^a striata. — Shell oval, prominently convex, with 
numerous, slightly elevated, equal, equidistant radiating lines : 
summit glabrous, wax-yellow, subacute, inclining towards the left 
side and the posterior end ) inner valve patelliform, dilated, attached 
by one side to the shorter side of the shell ; acutely angulated at 
the anterior line of junction, and rounded behind, and rapidly at- 
tenuated to an acute tip, which nearly corresponds with the inner 
apex of the shell. 
Length less than nine-tenths of an inch. 
This species belongs to my indicated genus Dispotsea. I am 
indebted for it to Mr. John S. Phillips, who obtained two speci- 
mens on the coast of New Jersey, about three miles north of Long 
Branch. 
Venericardia tridentata. — Shell suborbicular, subequi- 
lateral, thick and ponderous, with about eighteen convex, longitu- 
