GONIOBASIS. 205 



87. G. comma, Conrad. 



3/e?ajitrtComma, Conrad, New Fresh- Water Shells. p.SS.t.S, f. 7,1834. Wheatley, 

 Cat. Shells, U. S., p. 24. Reeve, Monog. Melauia, sp. 107. Binnev Check 

 List, No. 61. DeKay, Moll., New York, p. 9.5. Jay, Cat. 4th edit., p. 273. 

 Brot, List, p. 35. Catlow, Conch. Nonieno., p. 183. MiJLLER, Synopsis, 

 p. 45. 



Melasma comma, Conrad, Adams, Genera, i, p. 300. 



Dcscrijnion.— Shell subulate, much elongated, slender; whorls eight 

 or nine, flattened, iudented at the sutures, with longitudinal, distant, 

 slightly arcuated ribs, disappearing ou the lower volutions; labrum 

 thin; aperture elliptical, produced at base; color „.„ ,„, p. 

 olive, with a dark band above the middle of each 

 whorl. 



Habitat. — Inhabits rivulets which are tributary to 

 the Black Warrior in mountain districts in Alabama. 



Observations. — It is greatly elongated, and the 

 ribs are separated by an indented space at the 

 sutures. — Cunrad. 



A slender variety, which we have figured, occnrs in Ten- 

 nessee. The first figure is from tlie tyi:)e in collection of 

 Acad. Nat. Sci., Philadelphia. Mr. Haldeman possesses an 

 author's example. 



88. G. acuta, Lea. 



Melania acuta, Lea, Philos. Trans., iv, p. 101, t. l.i, f. 32. Obs., 1, p, iii. Troost. 

 Cat. Shells, Tennessee. Wheatley, Cat. Shells, U. S., p. 24. Binney. Check 

 List, No. 4. Brot, List, p. 3. Reeve, Monog. Melania, sp. 274. 



Ceriphasia acuta, Lea, Adams, Genera, i, p. 297. 



Description. — Shell acutely turreted, tliin, horn-colored ; apex acute ; 

 whorls eight, carinate immediately above the suture, longitudinally 

 Fig 405 undulated and transversely lineated; base angulated: aper- 

 ture white, and one-fourth the length of the shell. 

 Habitat. — Tennessee Iliver; Prof. Vanuxem. 

 Diameter, five-twentieths; length, thirteen-twentieths 

 of an inch. 



Observations. — I have seen no described species to wliich 

 this bears a close resemblance. Its delicate form, furnished with 

 undulations and transverse lines, will easily distinguish \1. — Lea. 



