124 OC1NEBRA. 



short, closed. Yellowish, with a brown blotch on the shoulder 

 between each varix ; aperture and columella tinged with pink. 



Length, -75 inch. 



Hab. unknown. 



This species is perhaps wrongly placed in Ocinebra ; it has 

 some resemblance to Tritonidea (Pisania) and might, perhaps, 

 be ranged with M. cinereus (.Fusus), Say, in the genus Urosal- 

 pinx, which seems to occupy an intermediate position between 

 Ocinebra and Tritonidea. Unfortunately, the animal and oper- 

 culum are unknown. 



#\ Group of M. lugubris. Distribution, Pacific ; Japan ; North and 



South America. 



M. LUGUBRIS, Brod. PI. 37, figs. 438-440. PL 38, figs. 455, 456. 



Six varicose, varices rather narrow, somewhat laminate, 

 crossed by wide, rather flat ribs and intervening sulcations ; 

 spire turrited, spiny nodose ; body whorl shouldered, the varices 

 raised into curved spines on the shoulder ; canal rather short, 

 closed. Chestnut-brown, the sulcations usually darker. 



Length, 1-25 inches. 



Peurto Portrero, W. G. of Cent. Am., in coral rocks. Magdalena Bay, 

 Low. Gal. ; dredged from a sandy floor, 7 fathoms. Hinds. Guaya- 

 quil, muddy floor, 21 fathoms. Hinds. 



I include with this species JIT. r-c///V///o.s^x, Reeve, (fig. 455), J/. 

 hamatus, Hinds, (fig. 439), and M. perittts, Hinds, (fig. 438), the 

 latter being the young. Its nearest affinities are with M. erina- 

 ceus', of Europe. M. erinaceoidc*, Val., from the Gulf of 

 California has also been likened to M. erinaceus, and in all 

 probability should be referred to M. luyubrix instead of to M. 

 alveatus, Kiener, with which Carpenter has likened it. Another 

 synonym is M. Barbarensis, Gabb., which is thus described: 

 Brown ; whorls shouldered ; varices five to nine, not very prom- 

 inent except on the shoulder, where they are sometimes prolonged 

 into -a recurved spine ; whole surface covered with strong revolv 

 ing ribs, crossed by fine squamose plates ; aperture sub-elliptical, 

 lip with a broad varix and five or six internal dentations ; canal 

 closed, straight or a little recurved. 



Length, '77, lat. '44 inches. 



Catalina M., 40 fms., Santa Barbara Channel, 20 to 30 fms. 



Also post-pliocene. 



