APPENDIX. 



Among Mr. Say's manuscripts I find the following 

 observation and description of a new species of Chiton, 

 which it is deemed proper to pubhsh at the present op- 

 portunity. — Ed. 



Venus cingenda, DUlw. 



V. CANCELLATA, Lam. 



Having obtained numerous specimens of this variable 

 shell, I find that my V. elevata must be placed as a variety 

 of it. 



CHITON, L. 



C. apiculahis, valves eight; dorsal triangles with series 

 of elevated points; lateral triangles with scattered ele- 

 vated points. 



Inhabits the coast of South Carolina. 



Whitish; oval-oblong, convex, subcarinated; eight 

 valved; anterior valve with numerous, separate, elevated, 

 equal, sub-equidistant points; the six following valves 

 have on their dorsal triangles from twenty to thirty lon- 

 gitudinal series of equal, elevated, approximate rounded 

 points; their lateral triangles with elevated points, as on 

 the anterior valve; posterior valve nt base like the dorsal 

 triangles, and its broad margin wath the points like those 

 of the anterior valve. 



Length nearly half an inch. 



This very pretty species was sent to me from Charles- 

 ton by Dr. Ravenel, of that city, .who informs me that it 

 is so rare that he has not found more than this specimen, 

 which he has been so liberal as to present to me. The 

 regular, longitudinal series of elevations on the dorsal 

 triangles, resemble so many minute strings of pearl. 



