[27] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 237 



horny rings relatively wider and more incurved ; the denticles of the 

 outer margin are strongly incurved and decidedly narrower and more 

 acute than the lateral ones, which are broad-triangular ; the inner or 

 front denticles are rather smaller, acute-triangular, and usually inclined 

 somewhat inward. On these there are forty to forty-six denticles. The 

 rings of the smaller suckers are still more oblique and more contracted 

 at the aperture than those of the larger ones, with the teeth more in- 

 clined inward, those on the outer margin being largest. 



Among the loose sucker-rims there are some which differ from the 

 others in having the rim more oblique, and the inner edge with nearly 

 obsolete teeth. These suckers of the second kind differ from the cor- 

 responding ones of A. princeps in having, on the outer margin, more 

 numerous, more slender, and sharper teeth, which taper regularly from 

 base to tip and are not so flattened. The larger of these sucker-rims 

 (?) are 14.5 mm in diameter across the base; aperture, 9 mni ; height at back, 

 7™ m ; in front, 2 mm ; number of large denticles on outer margin, ten to 

 fourteen ; the inner margin, except in the smaller ones, is either finely 

 toothed or distinctly crenulated, and there are usually one or more irreg- 

 ular, broad, sharp lobes or imperfect teeth on the lateral margins. The 

 teeth of the outer margin are regular, strongly incurved, tapering from 

 the base to the very sharp tips, and sharply beveled on the edges. A 

 smaller one (j), lL mm across the base and 4.5 n " n across the aperture, with 

 height of back G" im , has five regular sharp teeth on the outer margin, 

 two broad irregular ones on each side, while the front edge is nearly 

 entire. These are supposed to come from the ventral arms. Others (h) 

 are completely intermediate between the two principal forms, having 

 very oblique rims, with a small aperture, but distinctly denticulate all 

 around, the denticles on the inner margin being distinctly smaller than 

 on the outer. 



Measurements of sucker-rims from short arms (in millimeters). 



The two long tentacular arms are remarkable for their slenderness and 

 great length when compared with the length of the body. Mr. Harvey 

 states that they were each 731.5 cm (24 feet) long and 7 cn: (2.75 inches) in 

 circumference when fresh. In the brine and alcohol they have shrunk 

 greatly, and now measure only 411.5 cm (13.5 feet) in length, while the 

 circumference of the slender portion varies from 5.7 cm to 7.25' m (2.25 to 

 3.25 inches). These arms were evidently highly contractile, like those 

 of many small species, and consequently the length and diameter would 



