122 OCINEBRA. 



M. NucuLA, Reeve. PI. 36, fig. 420. 



Six varicose, crossed by ribs which becorae more prominent 

 on the varices ; a coronal of short spines on the shoulder ; canal 

 and spire moderate. Whitish, mottled with brown. Length, 

 •75 inch. 



Isle of Gapul, FMUipines, Cuming. 



Sowerby formerly considered this a variety of his M. cyclostoma; 

 it may be so ; but appears to me to be less crowded with ribs, 

 and to differ in the coronal of short tubercles or spines. 



M. NUCEUS, Morch. PI. 31, fig. 429. 



Rhomboidal, thick, five to six varicose, varices thickened, 

 fimbriated ; with about ten revolving, scabrous ribs, alternately 

 smaller ; spire rather elevated ; aperture small, oval ; canal short. 

 White, sometimes the varices chestnut-color. Length, 1 inch. 

 West Indies, Bermudas, Coast of S. Carolina (1 spec). 



At St. Thomas it is found under stones in one or two feet 

 water (Krebs). 



M. PUDicus, Reeve. PI. 37, fig. 431. 



Seven varicose, shouldered ; spire deviated ; nodulose-spinose. 

 White. Length, 1-2.5 inch. 



St. Domingo. 



Notwithstanding the shouldered whorls, I thin-k this may prove 

 to be the same as M. mtceua. 



M. ASPER, A. Adams. PL 37, fig. 428. 



Whorls six, aculeatel}^ frondose on the varices ; white. Length, 



30 mill. 



Gulf of California (Adams). 



So close to M. jmdicus that I am inclined to think it will prove 

 to be a synonym. The assigned locality is doubtful. 



M. DENSUS, H. and A. Ad. PL 37, fig. 435. 



Angulate, solid, smooth, lightl}' spirally lirate, varices eight. 

 White. Length, 30 milL 



Habitat unknown. 



Possibly this is a form of M.'pudicus, Reeve, or M. riuceus, Morch. 

 It was described by Mr. A. Adams as M. inornatus., but as that 

 name was pre-occupied by Recluz, Messrs. H. and A. Adams 

 changed it to densus. Mr. Sowerby, not aware of this change, 



