ROSSI A. 159 



R. MOLLERI, Steenstrup. 



Distinguished from R. palpebrosa by having very large suckers 



on the clubs. 



Greenland. 

 R. MACROSOMA, Chiaje. PL 67, figs. 245, 246. 



Body smooth, short, broad, rounded behind ; fins thin, short, 

 semicircular, larger in front ; head short ; arms subulate, rather 

 compressed, elongated, unequal ; order of length 3, 4, 2, 1 ; cups 

 spherical, in two distinct rows at the base, and four at the tip, 

 with large smooth rings ; tentacles slender, cups at the base of 

 the clubs large, diminishing in size and augmenting in number 

 towards the end. Length, 5 inches. 



Shell lanceolate, two-thirds the length of the body. 



Great Britain to Mediterranean. 



With this I identify, with Forbes and Hanley, R. Jacobi, Ball, 

 described from Dublin Bay, Ireland. Steenstrup thinks these 

 are females, and that the next species, R. Owenii, Ball, is the 

 male of the same species ; to this, I may add that R. Panceri of 

 the Mediterranean Sea does not appear to me to be essentially 

 different from R. Owenii. 



The species is sedentary in habit, and is obtained by the fisher- 

 men in from 50 to 300 metres' depth. 



R. OWENII, Ball. PL 67, fig. 247. 



Differs from R. macrosoma by the cups being large, on long 

 peduncles, arranged in three rows, those of the centre row not 

 half the size of the side ones ; on the first pair of arms .more 

 numerous, more equal in size and smaller than on the other arms. 



Northern JSurope. 



See remarks under preceding species. 



R. PANCERI, Tozzetti. PI. 68, fig. 248. 



Body subcylindrical, attenuated behind ; fins subcentral, some- 

 what trapezoidal ; basal suckers in two rows, afterwards in four 



rows, pedunculated ; tentacula lost. 



Mediterranean. 

 See remarks under description of R. macrosoma. 



R. GLAUCOPIS, Loven. PL 105. 



Fins medial ; arms slightly webbed, order of length, 1,2 = 4, 

 3 ; suckers in two rows throughout ; tentacula long, graceful, 



