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APPENDIX. [By T. A. Conrad.] 
Among Mr. Say’s manuscripts I find the following observation 
and description of a new species of Chiton, which it is deemed 
proper to publish at the present opportunity. — Ed. 
Venus cingenda, Dillw. 
Venus 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 apioulatus.— Valves eight; dorsal triangles with series 
of elevated points ; lateral triangles with scattered elevated points. 
Inhabits the coast of South Carolina. 
Whitish ; oval-oblong, convex, subcarinated ; eight valved ; an- 
terior valve with numerous, separate, elevated, equal, sub-equi- 
distant points; the six following valves have on their dorsal 
triangles from twenty to thirty longitudinal series of equal, elevated, 
approximate rounded points ; their lateral triangles with elevated 
points, as on the anterior valve ; posterior valve at base like the 
dorsal triangles, and its broad margin with the points like those of 
the anterior valve. Length nearly half an inch. 
This very pretty species was sent to me from Charleston by Hr, 
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. 
[Addenda.] 
[The following generic descriptions were omitted in the Descriptions 
of Terrestrial Shells.” — Ed.] 
G-enus Helix.* — Shell subglobose, suborbicular, broader than 
long, spire convex ; aperture wider than long, diminished above by 
the convexity of the penultimate whorl. 
Ohs. The shells belonging to this genus are terrestrial, often in- 
habiting moist places; they are thin, brittle, and translucent; the 
young shells are umbilicate almost invariably. 
Genus Pupa.*}* — Shell spiral produced. Aperture contracted, 
[* Nicholson’s Encyclopedia. — Ed.] ’ 
[f Nicholson’s Encyclopedia 3d ed. Odostomiaof 1st and 2d. ed. — E d.] 
