STREPTAXIS. 73 



S. SINENSIS, Gould. PL 15, figs. 32, 33. 



Shell polished, faintly impressly striated above, greenish 

 white; whorls 7, with profound, minutely crenulated suture; 

 parietal wall with laminar tooth, lip flexuous, reflected; umbili- 

 cus rather large. I)iam., 6-10 mill. 



Hong Kong, China. 



Mollendorff, who has described vars. medius, attenuatus and 

 nanuSj describes the animal as yellowish or orange with the 

 tentacles yellow to blood-red. 



S. SOULEYETIANUS, Petit. PI. 14, figs. 4-6. 



Rimately umbilicated, greenish yellow ; whorls 6-7, closely 

 costate-striate above, obsoletely decussated by spiral lines, the 

 penultimate whorl subangulated ; base smoothish shining ; a 

 lamina on the parietal wall ; lip white, narrowly reflected. 



Diam., 13 mill. Seychelles Islands. , 



S. COSTULATUS, Mollendorff. PL 15, figs. 27, 28. 



Narrowly umbilicated, thin, yellowish ; whorls 6^, closely 

 arcuately costulate above, smoothish below; parietal wall with 

 an entering plica, peristome expanded-reflected, arcuate and 

 thinner above. Diam., 7 mill. China. 



Closely allied in form to S. Sinensis, Gould, but distinguished 

 at once by the costulate upper surface. 



S. COMBOIDES, Orb. PL 15, figs. 34-36. 



Shell perforate, smoothish, shining, yellowish ; whorls 6-7, 

 faintly striulate ; parietal lamina entering, compressed ; peris- 

 tome white, widely expanded, reflected, arcuate and obtusely 

 unidentate above, obsoletely thickened in the middle of the base. 



Diam., 10'5 mill. Bolivia. 



Approaches Section Odontartemon. 



S. BOREALIS, Heude. PL 15, figs. 29-31. 



Cylindrically narrowly umbilicated, glassy pellucid, polished ; 

 whorls 6, flattened, laterally convex, with narrow suture, 

 obsoletely costulate-striate above ; parietal lamina strong, com- 

 pressed ; lip white, thickened and reflected, sinuous above, with 

 an obsolete tubercle or varix on the outer lip and another on 

 the inner, more or less developed. Diam. 6'5, length 10 mill. 



China. 



