OCINEBRA. 123 



has recently substituted the name Adarhsi — a name which is itself 

 pre-occupied by Kobelt for alabastrum, Ad., not Reeve. 



M. soLiDUS, A. Adams. PL 31, fig. 430. 



Shorter and thicker than M. piidicus, the fronds more rudi- 

 mentary, the aperture smaller, canal more completely closed. 

 White. Length, 28 mill. 



Habitat unknown. 



Very probably a mere variety of 31. nuceiis or pudicus. 

 M. Jamaicensis, Sowerby. PI. 37, fig. 432. 



Varices eight, distant, narrow, interstices deeply cancellated. 

 Reddish-brown. Length, 20 mill. 



Jamaica. 



I have not seen this sj)ecies ; which is most readily distin- 

 guished from others of same form and sculpture by its color. 



M. CASTUS, A. Ad. PI. 37, fig. 433. 



Varices seven, rounded, shell globose-oval ; white. Length, 

 18 mill. 



China. 



Belongs to the cijclosfoma group and appears to be distin- 

 guished by its shorter foi'm and more numerous ribs. 



M. iNcrsus, Brod. PI. 37, figs. 43('), 437. 



Five to seven varicose, varices thick, rounded. Shell white, 

 crossed by chestnut-colored revolving ribs. Length, 1-25 to 1-5 

 inch. 



St. Elena, W. Columbia, 8 fathoms, Cumiug ; Catalina IsL, California, 



W. M. Gabb. 



Reeve's figure is somewhat suggestive of the preceding species ; 

 that of Sowerby (Conch., 111.) is much better. One of the speci- 

 mens obtained by the late Mr. Gabb, at Catalina Isl., is still 

 laj-ger than the latter figure, and corresponds to the figure of 

 M. gemma, Sowb. (Thes. Conch.), fig. 437. It looks enough 

 ditt'erent, at first sight, to constitute a distinct species, but the 

 differences appear to be due to the eroded or beach-worn condi- 

 tion of the gemma form. 



M. iMACULATUs, Rccve. PI. 37, fig. 442. 



Ovate, pyramidal, spire elevated ; whorls well rounded, tuber- 

 culately varicose and finely I'idged ; aperture oval, small ; canal 



