GONIOBASIS. 289 



to the truncated apex; upper whorls cariuatecl; aperture ovate, 

 tiuted with pink ; color light brown, with two dark reddish, Fig. 555. 

 approximate, narrow, revolving lines. 

 Fig. 557. Fig. 558. Habitat. — Tennessee. 



Length, h an inch. — Haldeman. 

 Melania abjecta, Haldeman. 



Goniobasis rubricata. — Shell carinate, conical, 

 rather thin, reddish-brown, polished, without 

 bands ; spire somewhat raised; sutures very much 

 impressed; whorls about seven, convex; aperture rather large, rhom- 

 boidal, pale reddish within; outer lip acute, scarcely sinuous; colu- 

 mella bent in, somewhat thickened. 



Operculum ovate, dark bi'own, with the polar point near the base 

 on the left. 

 Habitat. — Tennessee ; Professor Troost. 

 Diameter, -29; length, -71 of an inch. 



Observations. — These specimens sent to me long since by the late 

 Professor Troost are nearly all truncate. I formerly considered them 

 a variety of Melania (^Goniobasis) proxima, Say, but it is a larger spe- 

 cies, more exserted, and has a peculiar appearance in the Fig. 559. 

 whorls of the spire assimilating to a coiled rope. Several 

 young specimens are perfect to the apex, which shows that all 

 are more or less carinate, but very obtusely so. The decol- 

 late specimens have no appearance of a carina on the lower 

 whorls. All the specimens were covered with the black oxide of 

 iron, which being removed, the epidermis is found to be smooth, 

 polished and bright reddish-brown. Usually the upper part of the 

 whorl is slightly impressed, which gives to the curve of the whorl 

 a peculiar form. The columella is usually light brown, and some 

 specimens have a whiteness about the middle portion. The aperture 

 is about two-sevenths the length of the shell. — Lea. 

 Fig.560. Melania Taitiana. — Shell smooth, conical, rather thin, shin- 

 ing, horn-color; spire truncate, carinate towards the apex; 

 sutures impressed ; whorls rather convex ; aperture small, 

 elliptical, subangular at base, whitish. 

 Habitat. — Alabama River, Claiborne; Judge Tait. 

 Diameter, -25; length, -80 of an inch. 

 Observations. — Several years previously to the death of my friend. 

 Judge Tait, he sent me a number of this species, which in form 



L.F.-NV. S.IV. 19 



