GONIOBASIS. 177 



light colored; spire obtuse; sutures linear; whorls five, rather con- 

 vex ; aperture large, elliptical, angular at base, white. 



Habitat, — Tennessee. 



Diameter, -21 ; length, -42 of an inch. 



Observations. — But a single specimen of this was sent to me by 

 Dr. Troost. It is a very distinct species, and remai'kable for ^w. 343, 

 a single broad band on the upper part of the whorl. In other J^ 

 specimens this band may not always be found to present the i^ L 

 same character; and the number of bands in others again ^y 

 may even be increased. The aperture is about one-half the length of 

 the shell. — Lea. 



G. monozonalis is an unusually wide juvenile laqueata, as I 

 have ascertained from the inspection of numerous specimens. 



44. G. Pybasii, Lea. 



Goniobasis Pybasii. Lea. Proc. Acad. Nat. Sci., p. 266, 1862. Jour. Acad. Nat. Sci., 

 V, pt. 3, p. 313, t. 37, f. 157, March, 1863. Obs., ix, p. 135, t. 37, f. 157. 



Description. — Shell folded, very much drawn out, yellowish, thin, 



banded ; spire attenuate, sharp-pointed ; sutures impressed ; whorls 



seven, flattened; aperture ovately rhomboidal, whitish and 

 Fig. 344. > ) i' J 



banded within ; outer lip acute, sinuous ; columella slightly 

 bent in, somewhat thickened and twisted. 

 Habitat. — Tuscumbia, Alabama; B. Pybas. 

 3^3^ Diameter, -31 ; length, -82 of an inch. 



^jK") Observations. — I found four specimens among numerous 

 Melanidcc sent to me by Mr. Pybas. It is allied to Melania 

 (Goniobasis) Deshaye.siana (nobis), but it is more slender, has bands, 

 and has not the granulations of that shell on the upper part of the 

 whorls. It diflers from Lyonii herein described, in having a longer 

 aperture, being thicker, not being striate, and in having bauds. It is 

 evident that this species usually has four well marked I'evolving bands, 

 the two middle ones being approximate. The broadest is at the 

 bottom. In this character it is very like to Jilelania {Goniobasis) 

 'jrata, Anth., and it reminds one of Melania Goniobasis laqtieata, Sa3\ 

 In one of the specimens an indistinct fifth band is observable. The 

 folds are not very strongly marked and do not extend to the body- 

 whorl. They are not very close, are slightly curved and incline to 

 the left. The aperture is more than one-third the length of the shell. 

 L. F. w. S. IV. 13 



