GONIOBASIS. 197 



somewhat like M. calenaria, Say, but may be distinguished at once 

 by the number of stria:'. — Lea. 



This beautiful species being poorly represented by Mr. Lea's 

 figure I have had drawn a specimen named by Mr. Lea in 

 museum of jNIr. Anthony and also a younger shell in museum 

 of Mr. Haldeman. 



76. G. difficilis. Lea. 



Goniobash difficilis, Lea, Proc. Acad. Nat. Sci., p 207, 1SG2. Jour. Acad. Nat. Sci., 

 V, pt. 3, p. 317, t. 37, f. 103, March, 1853. Obs., ix, p. 139. 



Description. — Shell folded, somewhat attenuate, dark olive or brown- 

 ish, leather thin, without bands; spire attenuate, sharp 



' > f Pjg gg,_ pjg_ 3gg_ 



pointed; sutures regularly impressed; whorls about 

 eight, slightly convex; aperture rather small, ovately 

 rhomboidal, whitish within; outer lip acute, subsin- 

 uous; columella bent in, thickened and twisted. 



Habitat. — Tennessee; Dr. Edgar. 



Diameter, -31; length, -82 of an incli. 



Observations. — This is one of the 3Ielania (Gonio- 

 basis) Dc'shayesiana group, and is nearly allied to spams, herein 

 described, but may at once be distinguished from that species by 

 being flatter on the whorls, and by being of a darker color. There is 

 but a single adult specimen before me, the apical whorls of which are 

 eroded. Some of the young specimens are perfect to the apex, and 

 the upper whorls present close folds slightly curved and decussate, 

 with revolving stria;. These iire hardly perceptible on the adult 

 specimen. In outline it resembles Ildania {Goniobasis) columella 

 (nobis), but ditfers in the color and in the form of the lower part 

 of the columella- The aperture is about one-third the length of the 

 shell. — Lea. 



This shell is somewhat like G. glauca, but the whorls are 

 more convex. Except in the shell being more cylindrical, hac- 

 ulum is closely related to it. 



77. G. sparus. Lea. 



Goniobanis spartis, Lka, Proc. Acad. Nat. Sci., p. 207, 1802. Jour. Acad. Nat. Sci., 



V, pt. 3, p. 316, t. 37, f. lG-2, March. 18G3. Obs., ix, p. 138. 

 Goniobasis ceren. Lea, Proc. Acad. Nat. Sci.. p.2G8, 1802. Jour. Acad. Nat. Sci.> 



V, pt. 3, p. 32], t. 38, f. 171, Marcl), 1S03. Obs., ix, p. 1 13. 



