OP CONCHOLOGY. 32t 



9. L. nucleola, Anth. Figs. 10, 11. Smooth, very tliick, 

 eroded, ovate, cylindrical; last wliorl very mucli flattened 

 around the upper half; aperture small, oval. Light brown, 

 sometimes with 2 chestnut-colored bands. Tenn., Ala. 



10. L. undosa, Anth. Figs. 12, 13. Wrinkled, thick ; 

 whorls 6 — 7, convex, rapidly converging to the apes; body 

 whorl cylindrical, with a distinct, but rounded shoulder ; aper- 

 ture small, rhomboidal. Brown or olive, sometimes brown- 

 banded. Ky. 



Fig. 12 is typical (and young) ; Fig. 13 is the adult shell— rarinodosa. 

 Anth. 



11. L. obovata, /S'a^/. Figs, l-l — 16. Sub-obovate, thick ; 

 spire almost flat ; whorls 5, the body whorl large, inflated 

 above, acuminate towards the base. Dark broivn. Kentucky 

 and Ohio Rivers. 



Fig. 14 represents a mature shell, Fig. 15 is nearly so, and Fig. 16 de- 

 scribed by Mr. Lea as Hildrethiana, the young. 



12. L. consanguinea, Anth. Fig. 17. Ovate, smooth, 

 thick; spire short, acuminate; whorls 8, last two or three 

 much shouldered; body whorl large, slightly constricted 

 above. Brownish-olive, light purple within, faintly banded. 

 Ind. 



Whorls more convex, more numerous, and without the prominent an- 

 gular shoulder of L. undosa, Anth. 



13. L. COmpacta, Anth. Fig. 18. Ovate-conic, smooth, 

 thick ; spire obtusely elevated ; whorls 5, body whorl large, 

 sloping, sab-angulated near the base; aperture ovate, rounded 

 at base. Yellowish-green, with 3 very dark brown bands, 

 white and banded within. Ala. 



15. L. brevis, Lea. Smooth or striate, sub-cylindrical, 

 thick; spire rather short ; suture impressed ; whorls flattened ; 

 aperture ovate. Yellowish-brown, white within. Ala. 



16. L, fusiformis, Lea. Fig. 19. Sulcate obsoletely, dis- 

 tantly folded, fusiform, rather thin ; spire conical ; whorls 6, 

 the last inflated ; aperture elongate-rhomboidal, narrow, chan- 

 nelled at base. Eeddish-brown, 4-banded, white and banded 

 within. Coosa River, Ala. 



17. L. Downiei, Lea. Fig. 20. Sparsely nodulous, sub- 

 cylindrical; spire raised, obtusely conoidal ; suture irregularly 

 impressed; whorls 7, flattened, last rather large; aperture 

 large, rhomboidal. Chestnut-color, with several indistinct 

 bands, white and banded within. Cumberland River, Tenn. 



