62 



10. S. cylindraceum, Mighels. 24. S. s alebr osum, Anth. 



S. robusium, Anth. 



S. rectum, Anth., of Reeve. 



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



11. S. b u Ib osu m, Anthony. 25. S. glandu lum, Lea. 

 S. ovalis, Anthony. 26. S. i n c i s u m, Lea. 



12. S curtum, Mighels.* S. virens, Lea. 



S. quadratum, Anthony. 

 S. obliquum, Anthony. 



13. S. glan s, Lea. 



g. Shell globose. 



14. S. sphaericum, Anthony. 



SPECIES. 



1. S. c ar in i fe ru m, Anthony. 



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



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

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

 Schizostoma Showal(erii,-f Lea, Proc. Acad. Nat. Sci., p. 93, Mar., 1860. Jour. 



Acad. Nat. Sci., t. 35, f. 49, Mar., 1863. Obs. ix. p. 68. 

 Gyrotoma Showalterii, Lea, Binney, Check List, No. 334. Brot, List, p. 28. 



2. S. castaneum, Lea. 



Schizostoma ca.-itaneum, Lea, Proc. Acad. Nat. Sci., p. 186, May, 1860. Jour. 



Acad. Nat. Sci., v. pt. 3, t. '35, f. 50. Obs. ix. p. 69. ^ 



Gyrotoma castanea, Lea, Binney, Check List, No. 311. Brot, List, p. 27. 



3. S. o v o i d e u m, Shuttle-worth. 



Gyrotoma ovoidettm, Shuttleworth, Mittheil., Bern. Nat. GeselL, No. 50, p. 88, 

 July 22, 1845. H. & A. Adams, Genera, iii. t. 32, f. 4. 



4. S. e x c i s u m, Lea.J 



Melania excisa, Lea, Philos. Proc., p. 242, Dec., 1842. Philos. Trans, ix. 



1846. Jay, Cat., 4th edit., p. 273. 



Schizostoma cxcisa, Lea, Wheatley, Cat. Shells U. S. p. 28. 

 Gyrotoma excisa, Lea, Binney, Check List, No. 317. Brot, List, p. 27. 

 Melatoma excisum, Lea, Reeve, Monog. sp. 2. 



5. S. p u mil u m, Lea. 



Schizostoma pvmdum, Lea, Proc. Acad. Nat. Sci., p. 187, May, 1860. Jour. 



Acad. Nat. Sci., v. pt. 3, t. 35, f. 57, Mar., 1863. Obs. ix. p. 74. 

 Gyrotoma pumilit, Lea, Binney, Check List, No. 328. Brot, List, p. 27. 

 Schizostoma ylobosum^ Lea, Proc. Acad. Nat. Sci., p. 187, May, 1860. Jour. 



Acad. Nat. Sci., v. pt. 3, t. 35, f. 58, Mar., 1863. Obs. ix. p. 74. 

 G.t/rotoma alobosa, Lea, Biriey, Check List, No. 321. Brot, List, p. 27. 

 Melatoma globosum, Lea, Reeve, Monog. t. 3, f. 18. 

 Melatoma Alabamense, Lea, of Reeve, Monog. sp. 20. 

 Melatoma Showaiterii, Lea, of Reeve, Monog. sp. 23 ? 



6. S. e 1 1 i p t i c u m, Lea.|| 



Melatoma tlVpticum, Anthony r MSS. Reeve, Monog., t. 3, f. 21, Apr. 1861. 

 Gyrotoma elliptica, Anthony, Brot, List, p. 2 1 ?. 



* Synonym of bulbomm ? 



f Mr. Reeve's figure 23 of Melatoma [Showalterii does not represent this species, but S. pumi- 

 lum, Lea. 



J .Mr. Reeve an 1 DC. Brot, place ovoideum, Shutt., in the synonymy of this species. As T have 

 no means of comparing specimens of the latter with Mr. Lea's species, I have preferred to sep- 

 arate them at present. S. Babylonicum is a larger, wider, more robust species. 



$ The young of pumilum. 



|| Distinguished from bulbosum, Anth., by its more lengtheneJ form, and by the regularly con- 

 vex outline of the body whorl and spire. 



