14 



Mr. Anthony, not to Swainson, while he does not notice the name of Schizos- 

 toma. Mr. A. does not pretend to claim it, of course, but adopts Gyrotoma, 

 Mr. Shuttleworth's name, proposed in 1845, which being three years later 

 cannot have precedence. 



The genus Schizostoma seems to be capable of being divided into two natural 

 groups in the form of the fissura, the cut in the lip. In one group this fissnra 

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

 whorl ; in the other it is not deep and is oblique to the suture. 



In Mr. Anthony's paper (Proc. Acad. Nat. Sci. Feb., 1860) I recognize several 

 of my old species. His Gyrotoma demissa I believe to be my Schizostoma con- 

 stricla. His G. quadrata to be my S. incisa. 



Schizostoma castanea. — Testa carinata, conica, subcrassa, tenebroso-fusca. 

 imperforata ; spira. elevata ; suturis valde impressis ; anfractibus senis, planu- 

 latis, unicarinatis, quadrivittatis ; fissurii recta, angusta profundaque ; apertura 

 parviuscula, elliptica, intus vittata, ad basim subrotundata ; columella alba, in- 

 i-rassata ; labro acuto, vix sinuato. 



Hab. — Coosa River, Alab. E. R. Showalter, M. D. 



Schizostoma glans. — Testa. Isevi, ovato-conica, inflata, subcrass&, luteo-cor- 

 nei, striata, imperforata ; spira, obtuse elevata ; suturis regulariter impressis : 

 anfractibus senis, obsolete vittatis, ultimo subgrandi ; fissura recta, angusta 

 profundaque ; apertura parviuscula, elliptica, intus albida, ad basim obtuse 

 angulata; columella albida, superne incrassata; labro-acuto, subsinuato. 



Hab.— Coosa River, Alab. E. R. Showalter, M. D. 



Schizostoma gloeosa. — Testa transverse striata, globosa, subtenui, luteola. 

 imperforata; spira curta, obtuse conoidea ; suturis impressis ; anfractibus qua- 

 '.ernis, trivittatis, ultimo graudi; fissura recta, angusta brevique ; apertura 

 fubgrandi, elliptica, intus vittata, ad basim angulata ; columella alba, incur- 

 vata ; labro acuto, expanso. 



Hab. — Alabama. E. R. Showalter, M. D. 



Schizostoma virens. — Testa subnodulosa, curta, inflata, subcrassa, tenebroso- 

 viridi, exilissime striata, imperforata ; spira. obtusa ; suturis impressis ; anfrac- 

 tibus subplanulatis ct trivittatis ; fissura obliqua, brevique ; apertura elongata. 

 •ubpyriformi, intus tenebroso-vittata ; columella superne purpurata et incras- 

 sata ; labro acuto, sinuato. 



Hab. — Coosa River, Alab. E. R. Showalter, M. D. 



Schizostoma glandula. — Testa lasvi, curta, inflata, subcrassa, luteo-cornea, 

 exilissime striata, imperforata : spira obtusa; suturis valde impressis; anfrac- 



