OCTNEBRA. 131 



M. CONTRACTUS, Reeve. PI. 38, figs. 471-474. 



Light brown, the revolving ribs sometimes darker ' in the in- 

 terstices of the longitudinal plicae; aperture white within. 

 [Operculum purpuroid. Length, 1*4 inches. 



New Caledonia ; Philippines ; Viti Isles. 



Very closely allied to M. Poiilxoni but di tiers in the revolving- 

 lines of color being replaced by close sculpture; sometimes 

 these revolving riblets become alternate!}' larger. Reeve's Succ. 

 funtculatum (fig. 474). is certainly the same species, and I 

 scarcely doubt the identity of his B.con<-<>nlricnm, (fig. 472), and 

 />'. '//<//n'nni, (fig. 473), the hitter being a young shell with longer 

 spire than usual. 



M. LURIDUS, Midd. PI. 38, figs. 481, 485. 



Fusiform, spire elevated, canal short, open ; whorls closely 

 asperately lirate, the line crossing a few rounded ribs ; aperture 

 dentate within. Reddish or chocolate. 



Length, '35 to 1 inch. 



Sitka to California. 



The var. aspp.ra, Baird, appears to me to be simply the fresh 

 state of this species, specimens of which are generally water- 

 worn. In the latter condition, when starved into a narrow, small 

 form, Carpenter has distinguished them as var. nnuula. 



M. INTERFOSSUS, Carpenter. PI. 39, fig. 484. 



Shell narrower and more shouldered than the last species, the 

 lattice of revolving lira; and longitudinal ribs coarser and more 

 elevated; canal short, closed. Length, '4 to '75 inch. 



Sitka to California. 

 M. GRACILLIMUS, Stearns. PI. 39, fig. 480. 



Light brown, the revolving costre sometimes white, spotted 

 with red. Length, -5 inch. 



San Diego, CaL, to L. Gal.; Santa Catalina Is., common from 



low water to 30 fathoms. 



M. ciRCUMTEXTus, Stearns. PI. 39, fig. 478, 494. 



Whitish with brown blotches ; yellowish to purplish within. 



Length, '75 inch. 



California. 



I give in addition to the original figure, that of a larger 



