SCHIZOSTOMA. 359 



trates the truth of Mr. Brot's remark, that the genus is but 

 little known in Europe. 



6. S. ellipticum, Anthony. 



Melatoma eUipticum, ANTHONY. MSS., Reeve, Monog., t. 3, f. 21, April, 1861. 

 Gyrotoma elliptica, Anthony, Brot, List, p. 27. 



Description. — Shell oblong-ovate, yellowish-olive, encircled with 



three broad, greenish-black bands; spire rather pro- 



* 1 i- Iiig. 080a. 



duccd, obtuse ; whorls flatly convex, smooth, faintly, 

 rudely plicated towards the apex; aperture narrowly 

 ovate ; fissure deep. 



Habitat. — Coosa Kiver. 



Observations. — A well defined species, though par- 

 taking of the typical characters of some others. — lieeve. 



This shell somewhat resembles S. hulhosum., Anthony, but 

 is distinguished by its more lengthened form and by the reg- 

 ularly convex outline of the body-whorl and spire. 



7. S. laciniatum, Lea. 



Schizostoma laciniatum. Lea, Philos. Proc, iv, p. 167, August, 1845. Philos. Trans. 



X, p. 69, t. 9, f. 57, 1853. 

 Gyrotoma laciniata. Lea, Binnet, Check List, No. 321. Brot, List, p. 27. Adams, 



Genera, i, p. 305. 



Description. — Shell smooth, obtusely conical, rather thick, banded, 

 yellowish horn-color; spire obtuse; sutures excavated; whorls con- 

 vex; fissure deep; aperture elliptical, whitish within; columella 

 smooth, thickened above. 



Habitat. — Tuscaloosa, Alabama. 



Diameter, -25 ; length, -45 of an inch. 



Observations. — This is the smallest species I have seen. The 



mouth and fissure of this specimen are perfect, but the apex is much 



^. „ , eroded, and the number of whorls cannot therefore be ascer- 

 Fig. 6806. 



#tained. There are four bands very distinctly marked on the 

 inside. The aperture appears to be about one-half the length 

 of the shell. The fissure is very narrow and remarkably 

 deep, extending nearly one-fourth round the whorl. The 

 cicatrix along the suture is of a lighter color. The marks of growth 

 are dislinct, and give a laciniate appearance. — Lea. 



