72 STREPTAXIS. 



smooth on the body-whorl ; parietal lamella small, compressed, 

 lip somewhat thickened and reflected, thinner and arcuate above. 



Diam., 13 mill. 



Laos Mountains, Cambodia. 



Var. /? (PL 14, fig. 100), is described by Morelet as " Larger, 

 more oblique and thinner than the type." 



S. MICHAUI, Crosse and Fischer. PL 14, figs. 7, 8. 



Umbilicus impervious, shell solid, opaque, grayish white; 

 whorls 6^, closely arcuately ribbed-striate ; parietal tooth lingui- 

 form ; lip thickened, reflected, its extremities joined by a shining 



callus. Diam. 8, alt. 11'6 mill. 



Isl. Poulo Condor, Cochin China. 



This is one of the species of Mr. Ancey's group Oophana. 



S. EXACUTUS, Gould. PL 14, figs. 11, 12. 



Widely umbilicate, thin, semidiaphanous, white ; whorls 6, 

 closely lirate-striate above, last whorl smooth below ; suture 

 deep ; parietal wall with a strong laminar and an inconspicuous 

 second tooth ; lip white, reflected, narrower and sinuated above. 



Diam., 13 mill. 



Bur mail. 

 S. SANKEYI, Benson. PL 14, figs. 2, 3. 



Obliquely umbilicated, white ; whorls 7, the earlier ones sub- 

 planate, the antepenultimate rather acutely carinated at the 

 periphery, the last two deviating, and compressed around the 

 umbilicus ; closely costulately striate ; parietal wall with a 

 prominent entering lamella; peristome expanded, reflected, 

 narrower and sinuated above. Diam., 10 mill. 



Moulmein, Burmah. 



S. HANLEYANUS, Stoliczka. PL 14, figs. 9, 10. 



Rather widely profoundly umbilicated, grayish white ; whorls 

 6-^, filiformly striate above and below, base subangularly convex ; 

 first whorls flattened, antepenultimate acutely carinate, balance 

 deflected, rounded ; parietal wall with entering lamina ; lip 



reflected, sinuated above. Diam., 7*5 mill. 



Moulmein, Burmah. 



Too close to the preceding species ; from which it is said to 

 be distinguished by its smaller size, more depressed form, larger 

 umbilicus, and longer and more regularly rectangular aperture. 



