RUSSIA. 161 



lower margin ; the suckers very small, subglobular, crowded in 

 about eight to ten rows in the widest portion. 



Length from base of arms to posterior end, 4U mill. ; of body^ 

 25 mill.; of head, 15 mill.; of fins, 15 mill.; of arms, 1, 12'5; 

 2, 15 ; o, 18 ; 4, 13 mill.; of tentacles, 40 mill. 



Massachusetts Bay, off Gape Sable and Halifax, N. 8. 50 to 



100 fathoms ; in September, witli eggs, from the latter locality. 



I give detailed description of this species because it has not 

 not yet been figured : its close relationship to R. papillifera is 

 apparent. As I have already intimated more than once, I believe 

 that a larger acquaintance with the cephalopoda Avill result in a 

 great reduction of so-called species ; characters which are fre- 

 quently detailed at length as of specific importance, will be found 

 to be very variable. It is probable that both this and the fol-. 

 lowing, R. subleevis^ ave synonyms of R. papillifera, and that 

 the latter itself will fall into the synonymy of one of the older 

 described species.* 



R. suBL^vis, Verrill. 



Larger and relatively stouter than the preceding species, with 

 the fins larger and placed farther forward, the front edge of the 

 large, free lobe reaching nearly to the edge of the mantle. Head 

 large and broad. Sessile arms more slender and less unequal in 

 size than the preceding, and with the suckers arranged in two 

 regular rows throughout the whole length. Anterior edge of 

 mantle scarcely sinuous, advancing but little dorsally. Upper 

 surface of head and body nearly smooth, but in the larger speci- 

 mens with a few very small whitish papilhx^, most numerous near 

 the front edge of the mantle. 



Length from base of arms to end of body, 46 mill. ; of bodj^, 

 31 mill.; of head, 15 mill. ; of fins, 20 mill. ; of arms, 16, IT, 20, 

 15 mill, respectively ; of tentacles, 25 mill. 



Taken with the preceding species, and is the more common of 

 the two, in Massachusetts Bay. The diftercnces may prove to be 

 onl}' sexual, but this cannot be determined without a larger num- 

 ber of specimens. See remarks under R. Hyatti. 



* Sars makes B. papilUfera a synonym? of B. rjlaucopis. 

 31 



