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OF CONCHOLOGY. 323 



7. A. armigera, Say. Figs. 12 — 1-i. Elevated, conical ; 

 spire flatly concave; periphery angulate and tuberculate; 

 aperture small sul3-rliomboidal, acuminate below ; tlie tuber- 

 cles on the spire are partly concealed by the revolution of the 

 succeeding whorls. Various shades of brown, with frequent- 

 ly, narrow bands, which are greenish without and reddish 

 within the aperture. }Vabash River ^ Ind.; Ohio River, Ky.; 

 Tenn. 



8. A. Duttoniana, Lea. Figs. 15, 16. Fusiform, some- 

 what conical above ; whorls 5 — 6, flattened; suture linear, peri- 

 phery tuberculate ; aperture angular, elongated, acuminate at 

 base. Yellowish, with numerous green bands, which are red- 

 dish when viewed within the aperture. Tenn. 



Smaller and more fragile than No. 7, the tubercles only visible on the 

 periphery, concealed entirely on the spire ; aperture not so much channelled. 

 The 2d figure is fasciolaia, Reeve. 



9. A. stygia, Say. Figs. 17, 18. Obtusely turrited ; whorls 

 slightly convex ; suture distinct ; body whorl ventricose; peri- 

 phery a little angulated, with a few slight tubercles, some- 

 times obsolete ; aperture wide, obtuse below. Very dark 

 brown or black, without bands ; aperture sometimes purple. 

 Cumberland and Tennessee Rivers. 



10. A. funiculata, Reeve. Fig. 19. Shoi-tly fusiform ; 

 whorls few, flat, sharply sloping, regularly corded through- 

 out with narrow, deeply excavated ridges ; prominently keel- 

 ed at the periphery ; columella short ; aperture scarcely chan- 

 nelled. Brownish olive, with four brown bands within. Ala. 



I am unacquainted v?ith this species. 



d. Body loliorl loitli numerous tubercles in parallel roivs. 



11. A. iim a, Cbnr. Figs. 20, 21. Conic, sub-fusiform, with 

 revolving lines of tubercles of unequal size, which become 

 more prominent upon the augular periphery; spire conical; 

 whorls flat; suture not well marked; aperture narrow, acu- 

 minated below. Olive or light green, sometimes with darker 

 bands, which are purple within the aperture. Ala. 



12. A. verrucosa, Raf. Figs. 22 — 26. Ellipsoidal; 

 whorls 5 ; spire convex ; apex obtuse ; body whorl oval, with 

 four or five equidistant revolving rows of small transverse 

 tubercles ; aperture narrow ; base a little acuminate. Yellow- 

 ish, with sometimes broad green bands ; aperture white or 

 purple. Wabash River, Ind.; Ky., Tenn., N. Ala. 



