1G6 LAND AND FKESH-WATER SHELLS OF N. A. [PART IV. 



tare rather large, ovately rhomboitlal, whitish within ; outer lip sub- 

 siuuous ; columella bent in and twisted. — Lea. 



Hahitat.—'&QutoTa. County, northeast Alabama; G. Hallenbeck. 



Diameter, '44: of an inch; length, 101 inches. 



Observations. — Two specimens only were procured by Mr. Hallen- 

 beck, and these are before me. The smaller one is rather lighter in 

 color and inclines to be more brown. It is allied to Melania (Goni- 

 obasis) athleta, Anth., but is a shorter shell, with two or three less 

 number of whorls. It "also differs in being of a greenish color, and 

 in having fewer and more distant folds. It also differs in the base 

 of the columella being more direct. In our shell the folds are lost in 

 a carinate edge above the suture. In the body-whorl there are 

 minute venations. Immediately below the suture there is a line of 

 lighter color. The aperture is four-tenths the length of the shell. — 

 Lea. 



GoniobasisLeidyana.— Shell fo](\e(\, fusiform, rather thin, yellowish 



horn-color, without bauds ; spire obtusely conical ; sutures 

 Fig. 321. ' 



linear; whorls six, flattened; aperture very large, ovately 



rhomboidal, whitish within ; outer lip acute, thin ; columella 

 bent in, twisted at the base. 



Operculum ovate, thin, brown, with the polar point close 

 on the left margin, near to the base. 

 Habitat.— T^Gnton County? northeast Alabama; G. Hallen- 

 beck. 

 Diameter, -39 ; length, -80 of an inch. 



Observations.— Tvio specimens were sent by Mr. Hallenbeck for 

 my examination. Both have imperfect plica3 on the spire which is 

 very obtuse, and both are evidently adults. The upper whorls are 

 carinate, but the inferior whorl closes on the angle so as to obliterate 

 the carination. On the body-whorl this angulation is nearly obso- 

 lete. It has nearly the outline of Melania (Goniobasis) abrupta 

 (nobis), but that species is not plicate and is a thicker shell. The 

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

 to my friend, Joseph Leidy, M.D., who has done so much for Amer- 

 ican zoology and comparative anatomy. — Lea. 



31. G. perstriata, Lea. 



Melanin prrKtriata, Lea. Philos. Tr.ins., x, p. 29G, t. 30, f. 2. Obs., v, p. 53. BiN- 

 NEV, Check List, No. 203. Bkot, List, p. 3G. 



