214 MACRON. 



Genus MACRON, H. and A. Adams. 



This was originally described as a subgenus of Pseudoliva, 

 which it resembles in having an inferior revolving groove ter- 

 minating in a small tooth-like projection of the outer lip ; the 

 operculum, however, is unguiculate like that of the Eburna 1 , 

 whilst that of Pseudoliva is purpuroid. The more decided canal 

 and absence of sutural channel, and the rather persistent black- 

 ish brown epidermis, will distinguish it from the subgenus Zemira 

 of Eburna. Its locality, West Coast of North America, is also 

 a distinctive character ; Eburna being East Indian, and Pseudo- 

 liva African in distribution. The species are partly included in 

 Sowerby's monograph of Pseutfolwa in Thesaurus Conch., 

 Vol. III. 



M. KELLETTII, A. Adams. PL 82, fig. 477. 



Epidermis blackish or dark brown, under which the shell is 

 white. Whorls partially or entirely encircled with low, broad, 

 rounded ribs, sometimes only apparent on the lower part of the 

 body whorl, sometimes obsolete. Length, 1*75 to 3 inches. 



Sun Diego, Cal.; Gulf of California. 



Buccinum JEthiops, Reeve, has been confounded with this 

 species, but is a very different shell, entirety distinct in its over- 

 hanging ribs, broad flat shoulder, want of tooth on the lip, etc. ; 

 in fact is a synonym of Purpuru cingulttta. Linn. M. KelieUii. 

 Hinds, belongs to the genns Siphonalw. 



M. LIVTDA, A. Adams. PI. 82, fig. 478. 



Epidermis dark brown, whitish or livid beneath : surface 

 smooth except several incised strijv near the base. 



Length, 20 mill. 



Sf in Diego, Cal.; Todas Santos Bay, L. Cal. 



Mr. Stearns thinks this will prove to be a small form of M. 

 Kellettii, dwarfed by reason of its northern liabitat. Its perfect 

 growth, narrower form, much smaller size, and thick lip indicate 

 to me adult specimens of a "distinct species. 



M. WRIGHTII, H. Ad. donsf of Patagonia. 



M. COMMODA, H. and A. Ad. Hab. unknown. 



Neither of these species has been figured. 



