[35] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 245 



April, 1880, by Capt. O. A. Whitten and crew of the schooner "Win. 

 H. Oakes," by whom it was presented to the United States Commission 

 of Fish and Fisheries. It furnishes the means of completing the 

 description of parts that were lacking or badly preserved in the larger 

 specimens described above, and especially of the sessile arms and the 

 buccal membranes (Plate YI). 



The color of the head, so far as preserved, and of the external sur- 

 faces of the sessile arms, is a rather dark purplish brown, due to minute 

 crowded specks of that color, thickly distributed, with a pinkish white 

 ground-color between them. The outer buccal membrane is darker ; 

 the inner surfaces of the arms are whitish ; the peduncular portions of 

 the tentacular arms have fewer color specks, and are paler than the 

 other arms. 



This creature had been badly mutilated, as described on p. 18, long 

 before its death, as its healed wounds show, and to this circumstance 

 many of the imperfections of the specimen are due. 



Sessile arms. 



With the exception of the left arm of the second pair, none of the 

 sessile arms have their tips perfect. Therefore, it is not possible to give 

 their relative lengths. 



The dorsal arms are the smallest at base, and the third pair largest. 

 They are all provided with a rather narrow marginal membrane along 

 each border of the front side. These membranes are scarcely wide 

 enough to reach to the level of the rims of the suckers, though they may 

 have done so in life. The front margin, bearing the suckers, is narrow on all 

 the arms, but relatively wider on the ventrals than on any of the others. 

 Each sucker-pedicel arises from a muscular cushion that is slightly 

 raised and rounded on the inner side; these, alternating on the two 

 sides, leave a zigzag depression along the middle of the arm ; from each 

 of these cushions two thickened muscular ridges run outward to the 

 edge of the lateral membranes, one on each side of the pedicels of the 

 suckers. These transverse muscular ridges give a scalloped outline to 

 the margin of the membranes. These marginal membranes are nar- 

 rowest and the suckers are smallest on the ventral arms. The dorsal 

 and lateral arms are strongly compressed laterally, but slightly swollen 

 or convex in the middle, and narrowed externally to a carina, which is 

 most prominent along the middle of the arms, and most conspicuous on 

 the third pair of arms. The dorsal arms are rather more slender than 

 the second pair, and were probably somewhat shorter. 



The left arm of the second pair has the tip preserved, with all its 

 suckers present. On this arm there are 330 suckers in all. The total 

 length of the arm is 2G.25 inches. The first 50 suckers extend to 12.25 

 inches from the base; the next 50 occupy 4.5 inches; the next 50 cover 3.5 

 inches; the next 100 occupy 4.25 inches; the last 80 occupy 1.75 inches. 

 This arm is .SO of an inch in transverse diameter near the base; 1.20 



