GONIOBASIS. 



165 



Fig. 316. Fig. 317. 



Description. — Shell plicate, carinate, conical, rather thin, yellow or 

 chestnut-colored ; spire somewhat elevated ; sutures sulcate ; whorls 

 flattened; aperture small, elliptical; columella 

 smooth. 



Habitat. — Alabama. Tennessee. 



Diameter, -30 ; length, '98 of an inch. 



Oliservations. — This is jt, species not easily 

 confounded with any other known to me. The 

 character of the ribs or folds is peculiar ; they 

 being arrested near the sutures by an abrupt 

 carina, which has a smaller parallel one between 



it. The folds and the carina? arc conspicuous, being perfectly pro- 

 nounced. Two of the six specimens before me are of a dark chestnut- 

 brown, with the nacre of the interior quite rufous. One is more 

 horn-colored, having four bands and the nacre whitish. The three 

 others, all from Dr. Budd, are wax-yellow, the ribs less expressed, 

 and the interior j'cllowish. The apex of each being broken, the 

 number of whorls cannot be determined. I should think there were 

 about eight. The inferior part of the whorl is smooth. The aperture 

 is rather more than one-third the length of the shell.— Zea. 



Fig. 316 is copied from Mr. Lea's figure. The following 

 figure, from a shell In Mr. Anthony's collection, determined by 

 Mr. Lea, locality Georgi'a (?), is much broader in outline and 

 constitutes a well marked variety, if not distinct species. 



The following are synonymes : — 



Melania scabrella.—^\\c\\ somewhat fusiformly conoid, dull-chest- 

 nut, whorls 5-G, slopiugly convex, concentrically, closely, plicately 

 ridged, keeled above and below; sutures im- 

 pressed ; aperture oblong, ovate, canaliculately 

 produced at t!ie base. 

 Habitat. — Georgia, U. S. 

 Observations. — Distinguished by a 

 characteristic sculpture of arched, con- 

 centric ridges, interrupted by a keel, 

 which gives a peculiarly impressed aspect to the sutures. — 

 Anthony. 



Goniobasis stremin. — Shell folded, subfiisiform, brownish- 

 olive, rather thin, without bands; spire somewhat. raised ; 

 sutures very much impressed; whorls about i-even, flattened; aper- 



