STREPTAXIS. 63 



S. COSTULOSUS. Pfeiffer. PI. 12, figs. 30-32. 



Conoidal, obliquely finely costulate, distantly subvaricose ; 

 whorls 6^, the last with angulated periphery, somewhat flattened 

 base, and narrow umbilicus ; whitish under a yellowish epidermis. 



Diam., 17*5 mill. 



Solomon's Islands. 

 S. CYPSELE, Pfeiffer. PI. 16, figs. 98, 99. 



Shell elevated conoidal, whorls 9, subcostulate, slowly increas- 

 ing ; umbilicus wide and deep ; aperture very small. 

 Diam., 20 mill. 



Habitat unknown. 



Much resembles in form the Helices of the genus Sagda, 

 inhabiting Jamaica. 



S. APERTUS, Martens. 



Conoidally globose, widety urnbilicated, ribbed-striate ; whorls 

 6J to 7 15-, slowly increasing ; white ; aperture small, slightly 

 oblique, the peristome narrowly reflected. 



Diam. 21, alt. 14 mill. 



Brazil. 

 Yar. DEPRESSUS, Martens. Diam. 18'5, alt. 10 mill. 



An unfigured species. 



Subsection AMMONOCERAS, Pfeiffer. 



S. CHALCOPHILA, Orb. PI. 12, fig. 21. 



Shell largely perspectively urnbilicated, orbicularly depressed, 

 smooth, thin, finely striated, diaphanous, grajdsh horny; spire 

 obtuse; whorls 6, slantingly convex ; aperture obliquely lunar, 



lip simple. Diam., 16 mill. 



Bolivia. 



S. SKIAPHILA, Orb. PI. 12, fig. 22. 



Thin, nearly smooth, diaphanous; white; whorls 6; lip thin. 



Diam., 12 mill. 



"^"^\ i M "T^v. 



Cochabamba, Bolivia. 



\ R 



