STREPTAXIS. 75 



Subsection III. Pariete aperturali et peristomate armatis 

 (Odontartemon, Pfr.}. 



S. DECIPIENS, Crosse. PI. 15, fig. 44. 



Shell perforate, smooth, shining, yellowish white ; whorls 6^, 

 lightly striulate ; parietal wall with a strong compressed 

 lamina; lip white, widely expanded and reflected, arcuate, and 

 bearing a single tooth above. Diam., 13'5 mill. 



Chili* (Wright). 

 S. BURMANICUS, Blantbrd. PL 14, fig. 14. 



Narrowly umbilicated, thin, corneous, whitish, finely and 

 closely sinuately costulate ; whorls 6, the last with flattened 

 base and angulately compressed around the umbilicus ; parietal 

 tooth moderate ; lip white, thin, expanded-reflected, incurved 

 above and basally, forming internal obsoletely dentiform pro- 

 jections. Diam., 10 mill. 



Aracan. 



5. TROBERTI, Petit. PL 15, fig. 57. 



Shell perforate, minutely striulate, shining, yellowish ; whorls 



6, the last smooth, planulate and scrobiculate on the base ; 

 parietal lamina compressed, entering, long; lip thick, white, 

 expanded-reflected, with two basal teeth, the lower one the 

 largest. Diam., 6 mill. 



West Africa. 

 This is the type of Mr. Ancey's group Lammelliger. 



S. ANDAMANICUS, Benson. PL 14, figs. 1, 15. 



Shell rimately umbilicated, with oblique, curved, rib-like 

 striae ; suture deep ; whorls 6, the last becoming smooth ; 

 parietal wall with a compressed entering lamina; lip thin, acute, 

 somewhat expanded, compressed above, forming an interior 

 projection. Diam., 7 mill. 



Andaman Islands; Burmah. 



S. Blanfordianus, Theobald (fig. 15), from Burmah, is probably 

 only a local variety, as supposed by Mr. Blanford. 



S. LAYARDIANUS, Benson. PL 15, figs. 22, 23. 



Arcuately rimate, thin, lightly striate, corneous-white, suture 

 crenulated ; whorls 6, base slightly convex, umbilicus rugosely 

 striate ; aperture triangular, with an entering parietal lamina, 

 and triangular tubercle at the insertion of the lip ; lip expanded, 



