PHYLLONOTUS. 99 



M. ROTA, Sow)). PI. 25, figs. 219, 220. 



Very similar to M. scorpio, but not so scalariform, the suture 

 uot so much excavated, the whorls fuller, the varices palmated, 

 the canal shorter. Whitish. Length, 2 inches. 



Philippines, Moluccas, Per. Gulf, Bed Sea. 



M. SECUNDUS, Lam. PI. 25, fig. 22 L 



Smaller than M. rota., with five varices, that of the margin 

 much more numerously digitated, but the digitations not palmate 

 at the end. Brownish, spines and varices darker. 



Length, 1-1-5 inches. 



Philippines. 



,M. VARicosus, Sowb. PL 25, figs. 222, 224. 



Has more -varices than the three preceding species, counting 



from six to eight ; marginal digitations palmate, more numerous 



than in M. scorpio or 31. rota. Whitish or light brown, varices 



dark browai. Length, 1-2 inches. 



Bed Sea, on Madrepores. 



I do not find any essential characters by which to separate M. 

 digitatus^ Sowb., (fig. 222). 



M. FENESTRATUS, Chemn. PL 25, fig. 223. 



An elegant shell, of marked individualit}'. The specimens 

 usually seen in cabinets are, however, much worn ; so that but 

 little or no trace of the fimbriated spines remains. Ordinarily five 

 to six varicose. The coarse lattice-work of ribs and interstices of 

 dark colored pits which cover the surface is very characteristic. 



Length, 1-5-2 inches. 



Philippines, Bed Sea. 



Sub-genus Phyllonotus, Swains. 



M. ROSARIUM, Chemn. PL 22, fig. 199 ; pi. 28, fig. 255. 



Shell covered with coarse revolving ribs, which are tuberculate 

 on the seven or eight scaly varices and on the single intermediate 

 ribs. Yellowish brown, with three interrupted chocolate bands • 

 rose color, with three deeper bands within the aperture. 



Length, 3 inches. 



Senegal, Fernando Po. 



