PHYLLONOTTTS. 109 



M. DIADEMA, Aradas and Benoit. PL 29, fig. 265. 



Length, -5 inch. 



Mediterranean at Palermo. 



M. HEXAGONUS, Lam. PI. 29, fig. 262. 



Usually pale yellow ; operculum dark brown, its initial point 

 sharp. Length, 1 to r*75 inches. 



West Indies. 



M. DUBIUS, Sowb. PI. 29, fig. 266 ; pi. 30, fig. 275. 



Yellowish to chestnut brown, the spinous tubercles darker. 



Length, '75 to 1*25 inches. 



Panama. 

 Var. squamulata, Carp. 



Shell white ; minutely imbricately squamose. 



Cape St. Lucas. 



Closely allied to M. cristatus and M. hexagonus. It has been 

 referred to Sistrum on account of its tuberculate (almost plicate) 

 columella and teeth within the lip, but its operculum is muricoid. 



M. PAZI, Crosse. PI. 29, figs. 269-271. 



A remarkable shell dredged at considerable depth with corals 

 in the West Indies. It has seven varices, a rather short but 

 sharp spire and long spines on the shoulder. Color milk white. 



Length, 1*4 inches. 



The type figured appears to be much distorted. Sowerby 

 figures a better example. Looks very like a miniature edition of 

 M. spinicostatuSj Val. 



M. PAUXILLUS, A. Ad. PI. 29, fig. 264. 



Very small, narrowly elongated ; varices seven, crossed by a 

 few elevated ribs, forming short, sharp fimbriations ; shoul- 

 dered, spire elevated, sharp ; aperture narrow, lip with five in- 

 ternal teeth, canal short, partly open, purplish, the revolving 

 ribs usually white. Operculum like Murex. 



Length, *5 inch. 



Mazatlan. 



M. ANGASI, Tryon, (M. scalaris, A. Adams). 



Shell scalariform, whitish, variegated with reddish-brown 

 whorls shouldered, the last with nine rounded varices and rather 



