GONIOBASIS. 183 



54. G. mutata, Buot. 



Melania Deshayesiana, Reeve. Monog. Melania, ep. 278, September, 1860. 

 ilelania mutata, Bkot, List, p. 37. 



Descriptioyi. — Shell acuminately ovate, raised at the apex, dull 

 olive; whorls slopingly tumid, the flrst few longitudinally plicated 

 plaits soon disappearing, transversely ridged ; ridges obso- 

 lete towards the aperture ; aperture ovate, rather con- 

 tracted, at the upper part; columella thinly effused at the 

 base. 



Habitat. — Tennessee, United States. 

 . Observations. — The whorls of this species are swollen in 

 a sloping manner towards the upper part, and the spire is 

 acuminately raised at the apex. The flrst few whorls are 

 decussately sculptured, but the sculpture soon becomes obsolete. — 

 Beeve. 



Changed hy Dr. Brot to mutata because Deshayesiana is 

 preoccupied by Mr. Lea. Tliis species is closely allied to 

 difficilis, Lea. 



55. G. suturalis, Haldeman. 



Melania suturalis, Haldeman, Supplement to Monog. Limniades, No. 1, Oct., 1840. 



Wheatlev, Cat. Shells, U. S., p. 27. Jay, Cat., 4th ecL, p. 275. 

 Goniobasis mutahilis, Lea, Proc. Acad. Nat. Sci., p. 270, 1S()3. Jour. Acad. Nat. 



Sci., V, pt. 3, p. 331, t. 38, f. 189, March, 1803. Obs., i.\, p. 103. 



Description. — Shell lengthened, conical, composed of six quite flat 



whorls, which are separated by a well marked angular suture. 

 Fig. 357. i^ J » , 



bordered on each edge by an elevated, revolving line, which 

 is double upon the body- whorl ; aperture narrow, elliptic, 

 one-half the entire length, bluish- white and banded; color 

 dark olivaceous or black. 

 Habitat. — Ohio. 

 Length, | of an inch. — Haldeman. 



An examination of the original and only specimen of sidu- 

 ralis convinces me that it is the same as G. mutahilis; and 

 that it is- not found in Ohio will, I think, be admitted. Prof. 

 Haldeman has probablj'" mistaken its hal^itat. 



The following is the description and figure of 



Goniobasis mutabilis. — Shell cariuate, plicate or striate, subfusi- 



