cmooREUs. 91 



M. TERRiTUS, Reeve. PI. 15, tio-. 152. 



Closely allied to the above species in color and snrface ; the 

 spines are so close as to form a continuous frill towards their 

 bases, but tlioy are longer, more direct and less frondose. The 

 principal distinction is that this species has only one large 

 tubercle between the varices — yet I have before me specimens of 

 M. palmife7^us in which one rib is much enlarged at the expense 

 of the other. Until more specimens of M. fen-itus are examined 

 it must be considered a somewhat doubtful species. 



Length, 2 inches. 



Sydney, Austr. 

 M. Penchinati. Crosse. PI. 15, fig. 150. 



Much more narrowly elongate than M. palmiferus, and deli- 

 cately tinted with rose-red, the revolving lines and fronds being • 

 darker ; like pahniferus it has two ribs between the varices. 



Length 1*6 inch. 



Liu-TscMu Islands. 



In the index to his Thesaurus, Sowerby makes this a synonym 

 of his 31. emarginatus. These species are so different that I 

 suspect he intended to quote some other name. 



M. NUBiLiTS, Sowb. PI. 15, fig. 153. 



" A dusky, ordinary looking shell ; and yet there is no other 

 species which exactly corresponds with it," remarks Mr. Sowerby. 

 Its principal features are the single, large inter- variceal rib and 

 the three revolving brown bands. Length, 1'5 inches. 



Hab. unknown (Coll. Cuming). 

 M. RossiTERi, Crosse. PL 15, fig. 15T. 



The single specimen on which this species appears to be 

 founded presents unmistakable evidences of depauperization in 

 its depressed spire and suppi'essed spines — the latter only ap- 

 pearing on the lower part of body-whorl and canal. The red 

 aperture and the single large rib between the varices show some 

 relationships to M. odustus. Length .35 mill. 



Lifou IsL, Loyalty Group, New Caledonia. 

 M. Thomasi, Crosse. PI. 15, fig. 154. 



Said to have three large, slightly spinous varices, and three 

 intermediate smaller ones ; the latter are probably only tubercles. 



