128 AMERICAN JOURNAL 



IB. A. subglobosa, Say. Figs. 86 — 96. Smooth, sub- 

 globose, or bell-shaped, very thick ; spire short, suture well 

 impressed ; whorls 5, the last very large, impressly flattened 

 around the upper part ; aperture ovate, rounded below, colu- 

 mella incurved, much thickened. W. Virg., Tenn., N. Ala., 

 N. Geo. 



Figs. 86—88, typical. Greenish or yellowish-brown, brown within. 



Fig. 89, globula, Lea. A young double-banded specimen. 



Figs. 90 — 92, gibbosa, Lea. A variety without bands. 



Figs. 93 — 95, tintmnabulum, Lea, including those specimens most in- 

 clined towards a campanulate form. Generally doubly-banded, or the 

 bands broken up into maculations, frequently purple within. 



Fig. 96, virgata, Lea. The young of the campanulate form. 



14. A. prserosa, Say. Figs. 97 — 100. Oval or sub- 

 globose, moderately thick ; spire very short, eroded, suture 

 irregularly impressed ; whorls 4 or 5, the last very large, in- 

 flated, subglobose almost the entire size of the shell, a little 

 flattened around the superior part ; aperture ovate or pyriform, 

 the lips very thick. Greenish or brown, with purple bands 

 or maculations, purple within. Ohio River to N. A la. 



Fig. 99 is A. angulata, Con., a half-grown shell from Flint River, Ala., 

 and Fig. 100 represents the quite young, Mel. Cincinnatiensis, Lea, from 

 the Ohio River. 



16. A. tssiliata, Con. Figs. 101 — 103. Oval or oblong, 

 thick, smooth ; spire eroded, suture irregularly impressed ; 

 body whorl subconical, flattened around the upper part ; aper- 

 ture small, ovate, lips remarkably thickened. Greenish or 

 brownish, generally with four equidistant purple bands, aper- 

 ture generally tinged with purple within. N. Ala. 



This is a longer, narrower species than A. prarosa; the colors are also 

 more vivid, the aperture smaller, and the lips thicker. The half-grown 

 shell is A. Coosaensis, Lea (Fig. 103). 



17. A. Troostiana, Lea. Fig. 104. Ovate, thick, smooth ; 

 spire short, suture well impressed ; body whorl thick, slopingly 

 convex; aperture small, widely oval, well rounded below. 

 Very dark brown, almost black, bluish within. Tenn. 



More ponderous and darker-colored than subglobosa, and having a more 

 elevated spire. 



18. A. pinguis, Lea. Fig. 105. Subrotund, smooth, in- 

 flated, rather thick ; spire very obtusely conical, suture well 

 impressed ; whorls 4, the last very large, slightly convex, an- 

 oulated in the middle ; aperture very large, widely oval. Dark 

 brown, without bands, white or purple within. Lebanon, Tenn, 



20. A. contorta, Lea. Fig. 106. Ovate, smooth, thick ; 

 spire elevated, suture very deeply impressed ; whorls very 

 convex, the last large, oval ; aperture small, nearly round, 

 columella much thickened and very much curved. Yellowish 

 horn color, Coosa River, Ala. 



