A. E. Verrill — North American Cephalopods. 369 



Arms siibequal, relatively short, stout, tapering to slender points, 

 connected for about one-third of their length by a web, which ex- 

 tends as a narrow membrane along their margins to near the ends. 

 Suckers small, not crowded, alternating pretty regularly in two rows ; 

 in the original type-specimen, which was not full grown, the arms of 

 the first pair each had about sixty-five suckers; those of the fourth 

 })air about sixty. In a large example ( ? ) the dorsal arms have 

 about 94; third pair about 100; foiirth pair about 90. 



In the male, the right arm of the third pair has its terminal portion, 

 for aboiit a third of its entire length, modified for reproductive pur- 

 poses into a large spoon-shaped organ (Plate XXXIIl, figs. 1, la, //), 

 broadly elliptical in outline; with the sides incurved and the end 

 somewhat tri-lobed ; its interior deeply concave with ten to twelve, and 

 occasionally, in the largest examples, thirteen, elevated transverse 

 folds; at the base, there is a fold bent into an acute angle, the 

 apex directed forward, leaving a deep V-shaped sinus behind it, wliich 

 is a continuation of a shallow groove formed by a thickening of the web 

 along the lower side of the arm, and terminating midway between it 

 and the fourth arm. At the end, this 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 ; the 

 basal portion of the arm bears 30 to 37 suckers, like those on the other 

 arras. The modified portion of the arm is considerably longer than 

 the distance between the constriction at its base and the interbrachial 

 web, and about equal to one-half the total length of the part which 

 bears suckers. The corresponding arm on the left side is of the ordi- 

 nary form and has, in a medium sized example, about fifty-one suckers. 

 The female differs but little from the male, externally, except in lack- 

 ing the modification of the third right arm. 



Length of the original male specimen, in alcohol, exclusive of the 

 arms, 44"'"'; breadth of the body, 31"""; between eyes, 18""'"; length of 

 the arms, of the first pair, from mouth, 18'""' ; from mouth to edge of the 

 web, 57"'"' ; length of modified portion of third right arm, 18'"'" ; breadth 

 of this organ when expanded, 11-5""". Subsequently somewhat lar- 

 ger specimens, both male and female, have been taken. 



One of the largest males (Station 878) measures from tip of dorsal 

 arms to end of body, 163'""^; from edge of dorsal web to end of 

 body, 75""" ; from edge of mantle, beneath, to end of body, 38 ; 

 breadth of body, 48; of head, 41; length of dorsal arms to beak, 

 110; of second pair, 112; of third pair, 115; of fourth pair, 110; of 

 hectocotylized arm, 85 ; length of terminal spoon, 33 ; its breadth, 

 17. This specimen has thirteen transverse lanielhc in the spoon. 



