STREPHOBASIS. 41 



ured. It is a mistake to assign the Ohio River as tlie habitat 

 of this si^ecies. 



Mr. Lea's descriptions and copy of his last figure here 

 follow : — 



Melania solida. — Shell smooth, obtusely conical, thick, solid, dark 

 horu-color; spire rather short ; sutures much impressed ; whorls con- 

 vex ; aperture small, rhomboidal, twisted at the base, white within ; 

 columella inflected. 



Habitat. — Tennessee. 



Diameter, "5 ; length, -O of an inch. 



Observations. — This species in form somewhat resembles 3L alveare, 

 Cour., on one side, and 2L canaliculata, Say, on the other. It has not, 

 however, either furrows or tubercles. The three specimens before 

 me have all mutilated apices, and therefore the number of whorls 

 cannot be correctly ascertained. There may be seven or eight. The 

 aperture is about one-third the length of the shell. There is no 

 appearance of bands in these. This is one of those species which 

 have a twisted aperture, being auger-shaped, the outer lip being 

 spread out, and the edge having a line of a double curvature. The 

 columella is very much twisted. 



Strephobasis solida. — Shell smooth, subcyliudrical, thick, solid, dark 

 horn-color or olive ; spire obtusely conical ; sutures im- 

 pressed; whorls slightly convex, the last slightly con- 

 stricted; aperture rather large, nearly quadrate, whitish 

 within ; outer lip acute, very sinuous ; columella sinuous, 

 thickened below and channelled backwards. 



Operculum subovate, very dark brown, with the polar 

 point near the middle of the base. 



Habitat. — Tennessee; E. Foreman, M.D. : East Tenn. ; 

 President Estabrook : Pulaski Creek, Kentucky ; Joseph Lesley. 



Diameter, -50 of an inch. 



Observations. — I described and figured an imperfect specimen of 

 this species in the Trans. Am. Phil. Soc, May 2, 1845, under the 

 name of Melania solida. The figure shows the specimen to have been 

 very imperfect in the aperture. Having subsequently received a 

 number of perfect specimens (except in the apex), and finding its 

 proper place to be in the genus Strephobasis, I have made a new 

 description, and propose to give a more perfect figure. Tlie spec- 

 imens before me, more than a dozen, vary much in outline, some 



