PHYLLONOTUS. 99 



M. ROTA, Sowb. PI. 25, figs. 219, 220. 



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

 not so much excavated, the whorls fuller, the varices palmated, 

 the canal shorter. Whitish. Length, 2 inches. 



Philippines, Moluccas, Per. Gulf, Red Sea. 



M. SECUNDUS, Lam. PI. 25, fig. 221. 



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 M. rota. Whitish or light brown, varices 



dark brown. 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 individuality. 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, Red 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. 



