GIBBUS. 89 



G. CLAVULUS, H. Adams. PI. 21, fig. 100. 



Profoundly rimate, somewhat thin, obliquely flexuously cos- 

 tellate, suture slightly dentate, last whorl subangulate at the 

 periphery, subplanate at base ; parietal wall with a strong 

 lamelliform tooth, columellar stoutly callous, obsoletely dentate, 

 lip subthickened, expanded, continuous. Length, 18 mill. 



Mauritius. 



Mr. Nevill and Dr. von Martens make this = the unfigured 

 G. striaticosta, Morelet ; if this be so, the latter name should 

 be used, having two years' priority of publication. 



G. VERSIPOLIS, Ferussac. PI. 21, fig. 6 ; PL 22, fig. 2. 



Profoundly rimate, rather thin, closely obliquel}' costellate, 

 somewhat shining, subdiaphanous ; light straw-color; parietal 

 wall sometimes dentate, lip somewhat thickened, shortly ex- 

 panded. Length, 12 mill. 



Mauritius. 



Var. MINOR (fig. 2). Spire more conoidal. Length, 10 mill. 



Pupa modiolus, Pot. et Mich., and Bulimus trochalus, Albers, 

 are synonyms. 



G. BOURGUIGNATI, Desh. PI. 22, figs. 3, 6. 



Profoundly rimate, suture narrow, deep, irregularly plicate- 

 striate ; yellowish gray ; lip thickened within, slightly expanded, 

 continuous, parietal tooth small, obtuse. Length,, 11 mill. 



Isle of Bourbon. 

 Var. INTERSECTA. Desh. Fig. 6. 



Spire somewhat more elevated, with distant distinct irregular 

 oblique costae. Length, 11 mill. 



G. CALLIFER, Morelet. PL 22, fig. 4. 



Profoundly rimate, thin, diaphanous, corneous, obliquely flexu- 

 ously costulate, the riblets bent upwards near the suture and a 

 little sharper there ; parietal wall with a small compressed tooth, 

 lip somewhat expanded, continuous. Length. 10-12 mill. 



Mauritius. 

 G. HOLOSTOMA, Morelet. PL 22, fig. 7. 



Profoundly rimate, obliquely flexuously costulate ; corneous ; 

 aperture with a compressed, elongate, parietal tooth, lip 



