STREPTAXTS. 79 



umbilicus ; aperture with six lip teeth and a twisted lamina on 

 the parietal wall ; lip white, rather broadty expanded, the extrem- 

 ities joined by a parietal callus. Diam., 8 mill. 



S. Canara, W. India. 

 S. SIAMENSIS, Pfeiffer. PL 15, fig. 73. 



Imperviously umbilicate, diaphanous, white, lightly costulately 

 striate, suture smooth, submarginate ; whorls 6J, the penultimate 

 acutely carinate, the last smooth and shining below ; peristome 

 white, reflected, flexuous above, four-toothed ; parietal wall with 

 a tongue-shaped lamina. Diam., 11 '5 mill. 



Siam. 

 S. DEPLANCHEI, Drouet. PL 16, figs. 80-82. 



Narrowly umbilicated, diaphanous, smooth, very shining, sub- 

 hyaline, white ; whorls 5 ; aperture with elongate basal and two 

 parietal teeth of which the lower is strongest ; lip white, 

 reflected. Diam., 5 mill. Ilet la mr ^ negr Cayenne . 



S. CONCINNUS, Blanford. PL 16, figs. 90-92. 



Shell umbilicated, rather indistinctly striate, shining, translu- 

 cent, pale yellowish white ; whores 5, the last convex, smooth and 

 polished below, compressed around the umbilicus, especially near 

 the mouth, with furrows corresponding with the teeth of the 

 aperture ; aperture with two parietal and five lip teeth one on 

 the columellar margin near the umbilicus, a second large and 

 double near the base, one lamellar and transverse at the base, 

 two inside the right margin, the lower being the larger and 

 almost bifid ; lip white, slightl}* expanded, extremities joined by 



a parietal callus. Diam., 6 mill. 



So. India. 

 S. PRONUS, Blanford. PL 16, figs. 93-95. 



Umbilicated, closely ribbed-striate above, polished, translu- 

 cent, pale yellowish white, suture but little impressed ; whorls 

 5^, last whorl somewhat flattened beneath, compressed around 

 and striate within the umbilicus, scrobiculate behind the aperture ; 

 aperture with a strong re-entering parietal plait, curved within 

 and subbifid in front, and four teeth one columellar, one basal, 

 and two (of which the upper is small) inside the right margin ; 

 peristome white, thickened, expanded, subcontinuous by a thick 



callus projecting from the parietal wall. Diam.. 6'*5 mill. 



India. 



