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 

 nanus, 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, closety 

 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 6J, 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. BOREALTS, 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. 



