SCIIIZOSTOJIA. 353 



F. Shell ovate, whorls obliquely flattened, spire obtuse. 



11. S. BULBOSUM, Anthony. 25. S. glandctlum, Lea, 



iS. oralis, Anthony. 20. S. ixcisuM, Lea. 



12. S. cuKTUJi, Mighels. S. virens, Lea. 



S. quadratum, Anthony, 



13. S. GLANS, Lea. 



*S'. obliquum, Anthony. 



Or. Shell globose. 

 14. S. SPii^RicuM, Anthony. 



SPECIES. 

 1. S. cariniferum, Anthony. 



Gyrotoma carinifera, Anthont, Proc. Acad. Nat. Sci., p. 66, Feb., 1860. Binnet, 



Check List, No. 310. Brot, List, p, 27. 

 Melatoma cariniferum, Anthony, Reeve, Monog. Melatoma, t. 2, f. 13. 

 Schizostoma Showalterii, LEA, Proc. Acad. Nat. Sci., p. 93, Mai'ch, 1860. Jour. 



Acad. Nat. Sci., t. 35, f. 49, March, 18G3. Obs., ix, p. 68. 

 Gyrotoma Showalterii, Lea, BiNNEY, Check List, No. 334. Bbot, List, p. 28. 



Description. — Shell conic, thick, dark brown ; spire obtusely ele- 

 vated, truncate, though not abruptly so, six "whorls remaining, one 

 or two having apparently been lost by truncation; car- Pig.670. 

 inations elevated, subacute and found on all the whorls, 

 two on each of the spiral ones and three to four on the 

 body-whorl; fissure direct, broad, and moderately deep, 

 extending about one-fifth around the shell ; sutures ir- 

 regular, much modified by the carinas, and often con- 

 cealed in part by them; aperture ovate and banded 

 within ; columella much rounded, callous at the lower part only ; 

 outer lip irregularly waved, its outline modified by the carinas on the 

 body-whorl ; no sinus. 



Habitat. — Coosa Eiver, Alabama. 



Length of shell, | ; breadth of shell, i of an inch. Length of aper- 

 ture, 5i-16 of an inch ; breadth of aperture, i of an inch. 



Observations. — This species cannot well be confounded with any 

 other yet described. In general form and in its armature, one is very 

 forcibly reminded of Melania annuUfera, Con., from which it dllTers, 

 however, not only generally, but by its more ovate base. The carina; 

 are lighter in color than the general body of the shell, and arc slightly 

 irregular or subnodulous in outline; it is a slout, heavy species, and 



L.F. W. S. IV. 2^ 



