200 A. E. VerriU — North American (Jephalopods. 



22'9, 20"3 and 17"8'"' (ten, nine, eight and seA'en inches) in circumfer- 

 ence.* They are, except the ventral, compressed trapezoidal in form 

 and tapei' very gradually to slender acute tips. Their inner faces are 

 occupied l)y two alternating rows of large obliquely campanulate 

 suckers, with contracted apertures, surrounded by broad, oblique, 

 thin, horny, marginal rings, much broader on the outer side than on 

 the inner, and armed with strong, acute teeth around their entire cir- 

 cumference, but the teeth are largest and most oblique on the outside 

 (Plate XVI, iig. 4 ; XVI«, figs. 6-8), These suckers gradually dimin- 

 ish in size to the tips of the arms, where they become very small, but 

 all that are preserved are similar in form and structure. The ventral 

 pair of arms still have, as they show in the photograph, the inner face 

 much broader than it is in the others, especinlly near the base, and 

 they are more nearly square than any of the others. Their suckers 

 are more numerous, farther apart transversely, and closer together in 

 the longitudinal series, there being about 46 on the proximal half (36 

 inches) of each, wiiile on each of the subventral arms there are only 

 about 30 on the corresponding portion ; the suckers also diminish 

 rather abruptly in size at .about 26 to 30 inches from the base, l)eyond 

 which they are scai'cely more than half as large as those on the 

 second and third pairs of arms, at the same distance from the 

 base. The largest of these suckers are said, by Mr. Harvey, to have 

 been about an inch in diameter, when fresh. The largest of their 

 marginal rings, in my possession, are 14""" to 16"'"' in diameter, at 

 the serrated edge, and 18™™ to 20™'" beneath. 



The hornj^ rings are yellowish horn-color, oblique, and moi-e than 

 twice as wide on the back side as in front. A wide peripheral groove 

 runs entirely around the circumference, just below the denticulated 

 margin; it is narrower and deeper on the front side. On the front 

 side the edge is nearly vertical, and the denticles point upward or are 

 but slightly incurved ; but on the outer or back side the edge and 

 denticles are bent obliquely inward; along the side the edge is more 

 or less incurved and the denticles are inclined more or less forward, 

 toward the front edge of the sucker. The denticles are golden 

 yellow, or when dry, silver}^ white ; those on the outer and lateral 



* In the original statement it is not mentioned to which pairs of arms these dimen- 

 sions apply. After having been five years in alcohol the ventral arms now measure 

 7 '5 inches in circumference, and one of the lateral ones (perhaps one of the third pair) 

 8 inches. The marginal membranes or crests had decayed, apparently, before the 

 arms were preserved : their terminal portions are also gone, so that the real length 

 cannot be given. 



