82 nion! s New Species of Mollusca 
C. punctatus, Las. with which some of the naturalists, 
in this city, have supposed ours might be identical, is 
described simply as ** C. testá octovalvá levi, corpore 
punctis excavatis," but besides this being, at best, a very 
unsatisfactory description, ours differs essentially in hav- 
ing the points elevatis, instead of ** excavatis." 
I have given the largest average size, but single valves 
and fragments were met with, indicating a shell consid- 
erably larger than any found entire. 
CHITON SAGRINATUS. 
C. testa parvulà, elongato-ovali, nigricante; valvis sub-carinatis, 
tenuissimé et concentricé striatis, minutissimé sagrinatis; areis later- 
alibus indistinctis; valvis terminalibus semilunatis; margine granu- 
lato. ` 
Long. eight twentieths, lat. three twentieths, of an 
inch. 
Hab. waters of Mass. Bay. 
My own Cabinet. 
Cabinets of Bos. Soc. Nat. Hist., A. A. Gould, M. D., 
Boston, John C. Jay, M. D. (N. Y.) 
Description. Shell small, elongated oval, covered 
with a fine, blackish, farinaceous substance, which is 
easily rubbed off, and leaves the (prevailing) color ashy, 
but in some specimens a blackish red; valves sub-cari- 
nate, with numerous, delicate, concentric strie, exhibit- 
ing, under the microscope, a beautifully regular granu- 
lation, resembling the finest shagreen ; lateral areas 
sometimes slightly defined on the three anterior valves, by 
a feeble ridge, extending from the apices to their posterior 
margin, but for the most part, without any distinct boun- 
dary ; valves without any projecting lamine; or denticula- 
= ^ 
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