E 
r * 
New Species of Megs Shells. 287 
X 
ow 
d + * 
* - Inhabits Dartmouth hare, and is found clinging to 
sea-weed a few feet below low water: mark, associated 
h with the Cerithium. reticulàtun, Totten, and Buccinum 
lunatum, Say. 
2 Cabinet of the Boston Society of Natural History, of 
Dr. A. A. Gould, of Prof. Hitchcock, and my own. 
i 
MN 
j 3 a 
F. 
ERTA, Retar. July 5th, of the present year, I found an 
~~ immaturé specimen of this species in the harbor of Dart- 
5 mouth, and at a subsequent visit to the same locality, 
iu obtained. about two dozen specimens in various stages of 
E growth. 
à; - This species is easily distinguished from the Cerithium 
s ! reticuldtum, not: only by the obvious character of hete- 
; d.  Tostrophy,, but by others more important, and too evident 
jv : . to require remark. It is more nearly allied to the C. 
p © peru sum, Lam., from which it differs in the black 
5 idge, and in the middle. series of granules, which 
‘the C. pervérsum is nearer to the upper than to the 
* ‘ower series. It differs from the Murex adversus of — 
ot Montague and Turton,  (Cerithium advérsum, Brown,) 
E? s in Pis ad the canal recurved, the whorls very distinctly 
fined by the impressed suture, and in the color, which, 
* "d n advérsum, is opaque light brown ; the 
ar briis Brown differs also in other respects from our 
5 is 4 "uec w » "aede s GarENIH. 
g E Pink V. fig. 12. 
a: sion C cy indraca, suprà tereti, rugoså ; spirà 
levi, acuta; suturà sub-du- 
columella subspirali; caudá per- 
|. aud Si ^ ied, EEE in the 
lower half, tapering above; thickly and deeply rugose 
7 a E 
