40 Say on Shells, &c. 
fatiscent. Amongst these I recognized a Crepidula, which 
differs from any 1 have seen, but is too imperfect to be de- 
its Soeealats. Sawa! A small lammated Cytherea, Lam. 
a Fissurella allied to F. greca, but immature. A Turri- 
tella, and fragments of a Balanus = considerable size, seve- 
| specimens of a Nucula and of a Calypt raca. The tw 
latter may be described as follows 
~ Nucula obliqua, valves obliquely subsiangulay obsoletely 
striate transversely, one or two of the strie more conspicu- 
ous, numerous, hardly perceptible feagitadined strie 5 ante- 
rior and posterior sides forming an acute angle ; ; umbo ob- 
tuse ; apex acute ; teeth angulated, prominent, cavity at the 
apex "of the hinge profound, rather long ; basal margin den- 
ticulatocrenate. 
Greatest length one fifth of an inch.— 
Very much resembles Arca nucleus Lin. but is a pilates 
species, and proportionally: narrower towards the apex, — 
hinge teeth aay te an 
Inge the cavity at t 
apex of the hing eis proportional 
Calyptrea eadidia, oval, on gi numerous slightly 
elevated, equal equidistant coste, and crowded obtuse, con- 
centric lines, which are regularly undulated by the coste 5 
mag mamillated inclining. to one side ; wnner valve pate- 
, dilated, attached by one side to the side of the shell, 
acutely angulated at the anterior junction, and rounded at 
the posterior junction, and rapidly tapering to an acute tip, 
which corresponds with the inner apex of the shell. 
ngth nearly one inch— 
Seems to approach, in its characters to the genus Infundib- 
ulum of Montf. but from the fatiscent state of the specimens, 
this cannot be acurately determined. No definite spiral su- 
ture is perceptible. 
Genus Baculites, Lam. 
Shells straight, cylindrical, xis) peat slightly conic, 
divided within into transverse septa, which are sinuous 
ramose on their margins and pierced with a siphunculus ; 
siphunculus at one aged of the longest transverse di- 
ameter. 
