1 1 () OCTOPUS. 



d. Back granular, rough. 



Arms sub-equal. 

 O. BAIRDII, Yerrill. PL 32, figs. 37, 38. 



Body short, thick, covered with irregular small tubercles ; 

 ocular tubercles one, large, several pointed ; arms short, sub- 

 equal, webbed one-third of their length ; about 65 suckers on the 

 dorsal and 60 on the ventral arms. Third right arm hectocotyl- 

 ized one-third of its length, the organ large, spoon-shaped, 

 somewhat trilobed at the end, deeply concave within, where 

 there are nine or ten elevated transverse folds ; at the base there 

 is a fold bent into an acute angle, the apex directed forward, 

 leaving a deep Y-shaped sinus behind it, which is in continuation 

 with a shallow groove formed by a thickening of the web along 

 the side of the arm and terminating midway between it and the 

 fourth arm ; at the end, the arm terminates in a small conical 

 tip, between the two broadly rounded lobes of the spoon-shaped 

 organ ; at the base of this organ there is a slight constriction, 

 below which the basal portion bears about 31 suckers. Length 

 of largest specimen (in alcohol), body and head, 1-75 in., dorsal 

 arms 2'25 in., web -70 in. ; breadth of body 1-25 in. Color when 

 living, usually pale bluish white, thickly speckled with light 

 orange brown and dark brown. 



Males only taken, 60 to 106 fathoms, by dredge. It is some- 

 what related to 0. Grcenlandicus, but the male of the latter has 

 the third right arm much longer, with the modified portion rela- 

 tively very much smaller and quite different in form, and with 

 more numerous folds, and the basal part bears 41 to 43 suckers ; 

 the other arms also have more numerous suckers ; the web is less 

 extensive and the body is more elongated. 



Casco Bay, Maine ; Bay of Fundy. 



Arms 4, 3, 2, 1 . 

 0. RUGOSUS, Bosc. PL 25, fig. 1). 



Body oval, purse-shaped, large, with a deep ventral groove, 

 not bearded ; head short, warty ; ocular beard one, elongated ; 

 arms short, thick, conical ; web short. Violet brown, white 

 beneath ; sides of arms netted with brown lines. 



