SCHIZOSTOMA. 373 



angular at the base ; columella white, incurved, somewhat thickened 

 below; outer lip sharp and sinuous. 



Habitat. — Coosa River, Alabama; W. D. Hartman, M.D. 



Diameter, '46; length, '96 of an inch. 



Observations. — This specimen, which I owe to the kindness of Dr. 

 Hartman of Westchester, Penn., was no doubt sent to him by 

 Dr. Showalter. It is distinct from any species I have before seen, 

 and is more nearly allied in outline to Bahylonicum (nobis) 

 than any other species I know. It differs in not being um- 

 bilicate, in not having a square shoulder, and in being 

 yellowish horn-color. It is impressed below the hem-like 

 margin of the suture, while the other is not. It is also 

 near to recta, Anthony, but is stouter, is of a light color, 

 and has a more twisted columella. The specimen in ray 

 possession is nearly an inch in length. With a perfect spire it would 

 exceed an inch. All is imperfect above the second whorl, but there 

 are indications of there being at least six. One specimen has no 

 bands, the other has three obscure ones. The aperture is about 

 half the length of the shell. The hem is rather narrow and is well 

 defined. I have great pleasure in naming this species after my friend 

 Dr. Hartman, who has done so much to promote natural science. — 

 Lea. 



23. S. constrictum, Lea. 



Schizostoma constrictum, Lea, Pliilos. Proc, iv, p. 167, Aug., 1845. Philos. Trans., 



X. \). m, t. 9, f. 55. 

 Gyrotoma constricta, Lea, BiNNEY, Check List, No. 302. Brot, List, p. 27. Adams, 



Gen urn, i, p. 305. 

 Gyrotoma recta. Anthoxt, Proc. Acad. Nat. Sei., p. 64, Feb., 1860. Bin'ney, Check 



List. No. 3.n. Bkot, List, p. 27. 

 Melatoma rectum, Anthony, Reeve, Monog., sp. 10, not sp. la. 



Description. — Shell smooth, cylindrical, yellowish, tliick; short, 



Fiff "04 originally furnished with about five low whorls, of which 

 three are nearly lost by truncation ; fissure moderately 

 broad, not quite direct and not remarkably deep; sut- 

 ui-es lightly impressed; aperture narrow ovate, occupying 

 about three-fifths of the length of the shell; within dusky 

 and obscurely banded; columella callous, thickened ab- 

 ruptly at the fissure. 



Habitat. — Coosa River, Alabama. 



Length of shell, eleven-sixteenths; breadth of shell, three-eighths 



