320 NEW MELANiDiE OF THE UNITED STATES. 



Remarks. — A few imperfect specimens only are before me, and the number of whorls 

 cannot be ascertained — probably eight. It is allied to Melania ( Goniobasis) coslulata 

 (nobis), but it is more cylindrical, and has the folds further apart. The aperture is 

 probably one-third the length of the shell. It has two or three decussating striae im- 

 mediately under the suture which make small nodes. I dedicate this species to my 

 friend President Lindsley, of Nashville, who sent it to me with many other shells from 

 the streams of Tennessee. 



Goniobasis Thorntonii. PL 38, fig. 168. 



Testa rugoso-plicata, couoidea, subtenui, cornea, evittatS ■ spira conoidea; suturis^irregulariter et valde 

 inrpressis ; anfraetibus convexiusculis, plicis flexis distantibus indutis ; apertura submagna, rhomboi- 

 dea, intus alba ; labro acuto, sinuoso ; columella subincurva, incrassata et contorta. 



Shell roughly folded, conoidal, rather thin, horn-color, without bands ; spire coni- 

 cal ; sutures irregularly and very much impressed ; whorls slightly convex, clothed 

 with distant bent folds ; aperture rather large, rhomboidal, white within ; outer lip 

 acute, sinuous ; columella somewhat bent in and twisted. 



Operculum ovate, thin, brown, with the polar point one-third from the base on 

 the left, of the centre. 



Proc. Acad. Nat. Sci., 1862, *p. 268. 



Hah. — Tuscumbia, L. B. Thornton, Esq. ; Florence, Alabama, Rev. G. White. 



My cabinet and cabinets of Mr. Thornton and Dr. Hartman. 

 Diam. -38, Length -87 inch. 



Remarks. — Some dozen specimens, most of them imperfect, are before me. The 

 number of whorls could not be ascertained — probably eight. The folds are large, dis- 

 tant and curving to the right ; about the middle of the whorl there is a line which de- 

 cussates the fold, making a node. It belongs to the group of which Melania (Gonio- 

 basis) costulata (nobis), may be considered the type, and it closely resembles Lindsleyi 

 herein described, but differs in not being cylindrical, in having larger and more dis- 

 tinct ribs and a larger aperture. The aperture is rather more than one-third the 

 length of the shell. I name this after L. B. Thornton, Esquire, Attorney at Law, 

 Tuscumbia, who very kindly has sent to me many fine specimens from his vicinity. 



Goniobasis interveniens. PI. 38, fig. 169. 



Testa plicata, conoidea, subtenui, tenebroso-comea vel fusca, vel bivittata vel evittata,; spira obtusa conoi- 

 dea ; suturis irregulariter et valde" inipressis ; anfraetibus instar senis, planulatis, plicis parum flexis ; 

 apertura subgrandi, rbomboidea ; intus alba vel vittata vel fusca ; labro acuto, sinuoso ; columella 

 incurva et parum contorta. 



Shell folded, conical, rather thin, dark horn-color or brown, double-banded or with- 

 out bands ; spire obtusely conical ; sutures irregularly and very much impressed ; 

 whorls about six, flattened, with slightly bent folds ; aperture rather large, rhom- 



