GONIOBASIS. 171 



received from Prof. Tuomey obtained during his geological survey. 

 Tliis is ratlier a small species between Melania {Goniohasis) 

 costulata (nobis), and Melania {Goniobasis) Edgariana (nobis). 

 It has a less number of folds than the former, and about the 

 same number as the latter, but these folds differ in not being 

 so much raised and protruded above as in Edgariana, nor is |),£;/;^ 

 the spire so high. The interior is usually white, sometimes 

 double-banded, and one of the specimens is dark brown. The 

 aperture is neai'ly half the Icugtli of the shell. — Lea. 



Resembles G. Curreyana, Lea, but differs iu being shorter 

 and wider. 



37. G. olivella, Lea. 



Goniobasis olivella, Lea, Proceed. Acad. Nat. Sci., p. 269, 18C2. Jour. Acad. Nat. 

 Sci.,v, pt. 3, p. 327, t. 38, f. 182, March, 18G3. Obs., ix, p. U9. 



Description. — Shell folded, fusiform, rather thick, olivaceous, shin- 

 ing, without bauds ; spire obtusely conical ; sutures irregularly and 



very much impi'cssed ; whorls about five ; somewhat convex ; 

 Fig. 329. J' i ' ' » 



aperture large, rhomboidal, whitish; outer lip acute, scarcely 

 sinuous ; columella bent iu and twisted. 

 Habitat. — Tennessee; Prof. Troost. 

 My cabinet. 



Diameter, -31 ; length, -GO of an inch. 

 ■ Observations. — I have two specimens before me A-arying little but 

 in size. It is a well characterized species, having folds, more or less 

 distinct on all the whorls. These folds are rather close, and incline 

 to thQ left. In one of the specimens there are two lines which cut 

 the folds immediately under the suture. In outline it is near to orna- 

 tella, herein described, but it cannot be confounded with that species, 

 •wluch is of a different color and banded. The aperture is nearly the 

 half of the length of the shell.— iea. 



38. G. interrupta, IIaldeman. 



Melania interrupta, IIat.demax, ."Supplement to No. 1, Monog. Liimniades, Oct., 



1840. WiiEATi-EY, Cat. Shells, U. S., p. 25. Jay, Cat., 4th edit., p. 274. BUOT, 



List, p. 34. Reeve, Monog. Mehiiiia, pp. 398. 

 Goniobasis Christyi, LEA, Proc. Acad. Nat. Sci., p. 269, 18G2. Jour. Acad. Nat. 



Sci., v. pt. 3, p. 328, t. 38, f. 18,'), March, 18'!3. Obs., ix, p. l.^iO. 

 Goniobasis instabilis, Lea, Proc. Acad. Nat. Sci., p. 209, 18 i2. Jour. Acad. Nat. 



Sci., V, pt. 3, p. 329, t. 38, 1'. iS(J, March, 18U3. Obs., ix, p. l.)l. 



