170 LAND AND FRESH-WATER SHELLS OF K. A. [PART iv. 



last one ventricose; aperture large, rhomboidal, whitish within; 

 outer lip acute, somewhat sinuous ; columella thickened, bent in and 

 twisted. 

 Habitat. — North Alabama; Prof. M. Tuomey. 

 Diameter, -35; length, -70 of an inch. 



Observations. — My friend, the late Prof. Tuomey, sent to me during 

 his geological survey of the state of Alabama, manj"^ new IloUusca, 

 most of which I described at the time. Some were laid over for 

 more leisure and further examination. Among them were a number 

 of this species which I now dedicate to his memory with 

 peculiar gratification. He was an ardent student of nature, 

 and warm and generous in his friendships. This species 

 varies very much. None of the specimens have perfect tips, 

 but some are nearly so, and display on the apical whorls very 

 minute and close plica). Some have minute venations on the 

 body-whorl. They are generally without bands, yet some have two 

 bands, but more frequently only one, which is about one-third of the 

 whorl below the suture. It is rather broad and distinct inside and 

 out. In outline and size it is closely allied to Mclania (Goniobasis) 

 gracilis (nobis), but it is not so high in the spire, nor is it so yellow. 

 The aperture is about one-half the length of the shell. — Lea. 



Differs from G. strenua in being more ventricose and in the 

 aperture being narrower below. This species is allied in form 

 to G. Leichjana, but in that species the body-whorl is plicate. 



36. G. interveniens, Lea. 



Goniohasis interveniens. Lea, Proc. Acad. Nat. Sci., p. 268, 1862. Jour. Acad. Nat. 

 Sci., V, pt. 3, p. 320, t. 38, f. 169, March, 1863. Ots., ix, p. 142. 



Description. — Shell folded, conical, rather thin, dark horn-color or 

 brown, double-banded or without bands ; spire obtusely conical ; 

 sutures irregularly and very much impressed ; whorls about six, flat- 

 tened, with slightly bent folds; aperture rather large, rhomboidal, 

 white, brown or banded within ; outer lip acute, sinuous ; columella 

 bent in and somewhat twisted. 



Habitat. — North Alabama ; Prof. Tuomey. 



Diameter, -32 ; length, -74 of an inch. 



Observations. — Some half dozen specimens were among the shells 



