158 POTAMIDES. 



(eight on the body whorl), forming obscure nodules ; yellowish or 

 brownish. Length, 5 mill. 



Cape Breton ; Mediterranean and Black Seas. 



It is f C. Scliwartzii, Homes, a fossil form, and C. pusillwn, 

 Jeffreys. The last-named would have priority, but Gould used the 

 name for another species six years earlier. Monterosato has enum- 

 erated vars. albina, ecostata and baliolina, but without description. 



Unfigured Spedes of Bittium. 



B. ORYZA, B. CINEREOFLAVA and var. CROCEA, B. ALABASTRULUM 



and B. GALACTIS, Morch. St. Thomas, W. I. 



B. YUCATECANUM, Dall. Yucatan Strait. 



B. RUGULOSUM, B. VICINUM, B. BICOLOR, B. GEMMULOSUM, 



B. LATUM, B. EXILE, all of C. B. Adams. Jamaica. 



B. ARMILLATUM, B. FASTIGIATUM, Carp. California. 



B. NITENS, Carp. C. St. Lucas, L. California. 



B. MINIMUM, B. TURBONILLOIDES, and B. SEMiLJEvis, Tenison- 

 Woods. Tasmania. 



B. EXILE, Hutton. New Zealand. 



B. TEREBELLOIDES, Martens (B. cinctum and B. Kirki, Hutton). 



New Zealand. 



B. CRATICULATUM, Gould. Hongkong. 



B. SCALATUM, Dunker. Japan. 



Genus POTAMIDES, Brong., 1810. 

 Subgenus PYRAZUS, Montfort, 1810. 



P. EBENINUS, Brug. PL 31, fig. 31. 



Longitudinally plicate, spirally ridged, angulated, nodose at the 

 angle ; dark chocolate color, spire usually lighter colored towards 

 the apex, aperture pale fawn color. Length, 4 in. 



Australia, N. Zealand. 



P. PACIFICUS, Sowb. PI. 31, fig. 32. 



Chocolate colored or brownish, spirally striated, whorls with an 

 acute spinose-nodose angle. Length, T5 in. 



Panama to Valparaiso. 



f C. Humboldti, Val., is a synonym. 



