[37] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 247 



The ventral arms are trapezoidal in section at base, and rather stout. 

 Breadth of front surface, near the base, exclusive of membranes, .55 of an 

 inch ; transverse diameter, .95 of an inch ; front to back, 1.25 inches. The 

 sucker-bearing surface is, therefore, broader than in the other arms. 

 The suckers are, however, distinctly smaller, and the proximal ones are 

 different in form from the corresponding ones on the other arms. They 

 are narrower and deeper, with more oblique and more contracted aper- 

 tures, more oblique horny rims, which are denticulated on the outer mar- 

 gins only. On the larger ones there are 12 to 15 sharp, incurved denti- 

 cles. In fact, the proximal suckers on the ventral arms agree better 

 with the middle suckers, beyond the 30th, on the other arms, for there 

 are none having wide-open apertures, surrounded by nearly even horny 

 rims, denticulated all around. The suckers diminish regularly in size, 

 and in the number of denticles, till at the 200th (w,here the arms are 

 broken off) there are but three denticles. 



Young A. Harveyi, No. 24. — Measurements of coins (in inches). 



