GONIOBASIS. 181 



eroded. Some of those before me are beautifully folded down to the 

 last half of the bodj^-whorl, the folds being rather large aud straight. 

 The surface varies very much ; some of the specimens being beauti- 

 fully malleate, while on others no such marks can be observed. The 

 outer lip is broken. The apex being eroded in all the specimens, I 

 am not sure of the number of the whorls ; there may be about six. 

 The aperture is about one-half the length of the shell. I dedicate this 

 species to Mr. Coleman Sellers of Cincinnati. — Lea. 



50. G. intersita, Haldeman. 



Melanin intersita, Haldemax, Monog. Limuiades, No. 4, p. 4 of cover, Dec, 23, 

 1841. BiN'XEV, Cheek List, No. 150. BuoT, List. p. 35. Keeve, Monog. Mela- 

 nia, sp. 37U. 



Description. — Shell conic, plicated, with four convex whorls; aper- 

 ture elliptical ; color olivaceous. 

 Habitat. — Swan Creek, Indiana; Mrs. Say. 

 Length, h of an inch. 

 Observations. — Allied to 3L comma. — Haldeman. 



Mr. Reeve's figure does not well represent this species 

 and his description does not accord with that given ^. ^^ 

 by Haldeman. He seems to have obtained a poor 

 specimen, which does not exhibit the longitudinal folds, ^^ 

 The above figure illustrates Prof. Haldeman's type. Wm 

 The species is interesting as being one of the few spe- 

 cies of the present group inhabiting north of the Ohio River. 



61. G. columella, Lea. 



Melania cohimella, Lea, Philos. Proc, ii, p. 13, Feb., 1841. Philos. Trans., viii, p. 179, 

 t. C, f. 33. Obs., iii, p. 17. DeKay, Moll. N. Y., p. 96. Binsey, Check List, 

 No. GO. TuoosT. Cat. Shells, Tenn. Wheatley, Cat. Shells, U. S., p. 24. 

 Cati.ow, Conch. Nomenc, p. 18(5. Bkot, List, p. 35. Keeve, Monog. Mela- 

 nia, sp. 441. 



Description. — Shell obscurely plicate, conical, rather thin, horn- 



„. color; spire rather elevated, striate towards the apex; sutures 



rig.353. ' ^ ' ^ ' 



impressed; whorls six, somewhat convex; aperture small, 

 elliptical, angular at base, whitish. 



Habitat. — Tennessee. 



Diameter, -20; length, -03 of an inch. 



Observations. — This species Is remarkable for the impressed 

 curve on the columella. In its gcnei-al character it resembles the 



