228 LAND AND FKESH-WATER SHELLS OF N. A. [PART IV. 



E. Whorls very strongly carinated, 

 117. G. acutocarinata, Lea. 



Melanin acutocarinata, LEA, Philos. Proc, ii, p. 14, Feb., 1841. Philos. Trans., viii, 

 p. 184, t. 6, f. 46. Obs. iii, p. 22. DeKay, Moll. N. Y., p. 99. Troost, Cat. 

 Shells, Tenn. Wiieatley, Cat. Shells, U. S., p. 24. Binney, Check List, No. 5. 

 Cati.oav, Conch, Nomenc, p. 18,5. Bkot, List, p. 36. 



Elimia acutocarinata, Lea, Chenu, Manuel de Conchyl., i, f. 1979. Adams, Genera, 

 i, p. 300. 



Melanin pagodiformis, Anthony, Ann. N. Y. Lye. Kat. Hist., vi, p. 106, t. 3, f. 6, 

 March. 1854. Binney, Check List, No. 195. Brot, List, p. 36. Reeve, Monog. 

 Melania, sp. 260. 



Melanin torulosa, ANTHONY, Ann. N. Y. Lye. Nat. Hist., vi, p. 110, t.3, f. 10, March 

 1854. Binney, Check List, No. 273. Brot, List, p. 37. Reeve, Monog. Mela- 

 nia, sp. 370. 



Description. — Shell carinate, conical, rather thick, shining, dark 

 brown; spire obtusely elevated ; sutures impressed; whorls six; ap- 

 rig.451. rig.4.52. erture rather large, elliptical, angular at base, purplish 

 within. 



Habitat. — Tennessee. 



Diameter, -30; length, -60 of an inch. 



Observations. — I received a single specimen only of 

 this species. It seems to be distinct in its large carina, which ex- 

 tends over all the whorls, but is scarcely distinct on the last. The 

 columella is remarkably indented. The aperture is nearly one-half 

 the length of the shell. — Lea. 



This shell is believed by Prof. Haldeman to be a variety 

 of sim2)lex, but I doubt if they are the same, as this species is 

 acutely carinate in some specimens, smooth in others, but as 

 it appears to me ahvays narrowly lengthened. 



The following is the description of: — 



Melania pagodiformis.— Shell conical, thin, brownish-olive ; spire 

 obtusely elevated ; whorls 7-8, smooth ; the upper ones are pjg_ 453, 

 surrounded by a sharp, elevated keel just above the suture ; 

 the body-whorl is angulated in the middle by two keels, of 

 which the upper is the more prominent; sutures deeply im- 

 pressed; aperture ovate, ending in an acute angle below, 

 whitish within; columella rounded, produced into a narrow, but 

 slight sinus. 



Habitat. — Battle Creek, Tennessee. 



