GOKIOBASIS. 245 



impressed ; whorls five, somewhat convex ; aperture large, elliptical, 

 within double banded ; columella rubigiuose, thickened, flattened, im- 

 pressed and much curved. 



nabitat. — Scioto Kiver, Ohio. 



Diameter, -25 ; length, -43 of an inch. 



This is a small, very remarkable species. There is a slight depres- 

 sion above the middle of the whorl, which gives it a somewhat 

 gibbous form. Tlie most unusual character pertaining to this species 

 is, however, the very flat and impressed columella, more im- pig. 477. 

 pressed at the point of the umbilical region. The columella 

 on the upper part of these two specimens is not thickened, 

 but it is of a dark brown color, and being also dark below the 

 color extends to the outer side of the whorl, and there makes two 

 rather indistinct bands. In outline it is allied to 31. fusiformis (nobis), 

 but thc}"^ difler entirely in the columella and in the length of the aper- 

 ture. The aperture is rather more than one-half the length of the 

 shell. I have had some doubts of the Scioto being the real habitat 

 of this shell ; but Mr. Wheatley says it was sent from thence to him. 

 It seems to have a more southern aspect. — Lea. 



139. G. graminea, Haldeman. 



Goniobasis graminea, Hald., American Journ. Conch., i, 37, 1. 1, f. 4, 1865. 



Description. — Shell fusiform, short, inflated; spire very obtuse; 



surface smooth, polished, brilliant green, with a light yellow, sutural 



band; spire brownish; whorls five, somewhat convex; aperture large, 



^. _ rhomboidal, somewhat angular below, bluish within; colu- 

 Fig. 478. a ' 



mella somewhat curved, tinged with brown. 

 Habitat. — Unknown. 



Diameter, -3; length, '56 of an inch. Aperture, -3; diam- 

 eter, -2 of an inch. 

 Observations. — This shell is very closely allied to G. Vauxiana, Lea; 

 but that species is banded, and the spire is carinatod ; it has not the 

 light sutural band which distinguishes graminea- — Ilaldeman. 



140. G. cognata, Anthony. 



Melania cognata, Anthony, Proc. Acarl. X.it. Sci., p. CO, Feb., 1800. Bixxet, 

 Check Li.st, Xo. 59. BUOT, List, p. 30. Kkkve, Moiiog. Melania, sp. 458. 



Description. — Shell ovate, short, smooth, moderately thick; spire 



