SCHIZOSTOMA. 351 



Melania {Goniohasis) germana, Anthony. It is a thinner shell than 

 either, and the notch in the lip removes it from that genus. The ap- 

 erture is about one-half the length of the shell. I have great pleas- 

 ure in naming this species after Mr. Grosvenor, to whom I am greatly 

 indebted for many of our western raoUusca. — Lea. 



Genus SCHIZOSTOMA, Lea. 



Schizostoma, Lea, Philos. Proc, ii, p. 242, Dec, 1842; iv, p. 167, Aug., 



1845. Philos. Trans., X, p. G7, 1847. Obs., iv, p. 41, 1847. Proc. 



Acad. Nat. Sci., May, 18G0. Jour. Acad. Nat. Sci., v, pt. 3, p. 245, 



March, 1803. Obs., ix, p. 07. 

 Schizucheilits, Lea, Philos Trans., x, p. 295, 1853. Obs., v, p. 51, 1823. 

 Gyrotoma, SHtTTTLEWOUTH, Mittheil. Naturforsch. Bern., p. 88, July 



22, 1845. Adams, Genera, i, p. 305, Feb , 1854. Gray, Guide to 



Mollusca, i, p. 103, 1857. Chexu, Man. de Conchyl., i, p. 293, 1859. 



Anthony, Proc. Acad. Nat. Sci., p. 63, Feb., 1860. Binney, Check 



List, June, 1800. BnoT, List, p. 27, 1862. 

 Melatoma, Anthony, Gray, Zool. Proc, p. 153, 1847. Woodward, 



Manual, p. 131, 1851. Reeve, Conch. Icon., March, 1860. 

 Apella, MiGHELS, MSS. 



Description. — Shell conical or fusiform ; lip fissured above; 

 aperture ovate ; columella smooth, incurved. 



Geographical Distribution. — The genus appears to be rc- 

 stricted to the waters of the Fig. got. Fig. 668. Fig.eco. 

 Coosa River, Alabama. 



Observations. — The genus 

 Schizostoma seems to be capa- 

 ble of being divided into two 

 natural groups in the form of 

 the fissura^ the cut in the lip. In one group this fissura is 

 deep aud direct, that is, parallel with the suture or upper edge 

 of the whorl (fig. GG7) ; in the other it is not deep and is ob- 

 lique to the suture (fig. 668). Fig. 6G9 represents the oper- 

 culum of S. ovoiOoum, vShutt. 



