STREPTAX1S. 63 



S. COSTULOSUS. Pfeiffer. PL 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. PL 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, widely umbilicated, ribbed-striate ; whorls 

 61 to 7 J, 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. PL 12, fig. 21. 



Shell largely perspectively umbilicated, orbicularly depressed, 

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

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



lip simple. Diam., 16 mill. 



Bolivia. 



S. SKIAPHTLA, Orb. PL 12, fig. 22. 



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

 Diam., 12 mill. 



Cochabamba, Bolivia. 



