58 U.S. NATIONAL MUSEUM BULLETIN 2 34 



In the female, III is only slightly larger than the others, only 

 slightly turned inward, and with a tapering point. The suckers are 

 biserial on all arms and with the exception of III are of normal 

 size, smaller basally and gradually increasing to the midpoint and 

 then decreasing slowly distad. On III, the first three or four pairs 

 of suckers are very small basally; others abruptly increase in size, 

 comparably to the midsuckers of the other arms. 



In the males, the suckers of I and II are imequal, those of the 

 ventral row about a third larger than those of the dorsal row; IV 

 is normal. In III, the arm is about twice as stout as the others 

 apparently permanently strongly incurved with the tip again turned 

 outward in an S-shape. Basally, about the first four pairs of suck- 

 ers are minute; the others become greatly enlarged on the ventral 

 row, moderately so dorsally. The left dorsal arm is hectocotylized 

 in the following manner: Basally there are two pairs of normal 

 suckers, equal in size. Distad of these, in the ventral row there is 

 a large swollen fleshy papilla turned downward and outward, and 

 attached to the inner surface of the arm except for a small portion 

 at the tip. From the outer side of the arm beneath this swollen 

 papilla arise two other papillae. In the largest male, both of these 

 are long and slender, curving outward and forward, the anterior 

 one about twice as long as the posterior one and twice as thick, 1.5 

 mm. in length. In the smaller males, the posterior papilla is much 

 smaller. Distad of this group of papillae there is an open smooth 

 area. Beyond this area the arm has the appearance in ventral 

 view of being twisted 45° to the right. Basally, there is a small 

 conical papilla on the oral surface, marking the origin of a heavy 

 pronounced fold or ridge which follows the arm to the distal tip 

 with an intervening clear space between the ridge and the crowded 

 suckers. Dorsally, there are two rows of crowded elongate papillae 

 bearing distal apertures, alternating in such a manner as to appear 

 to be one row. There is a palisaded effect on each side. External 

 to the fleshy ridge a short compact membrane coils the distal part 

 of the arm into almost a complete circle. 



The tentacles are long and slender, round in cross-section, but 

 slightly flattened on the oral surface. The clubs are short and ex- 

 panded, and bear four rows of small suckers, of which those of the 

 dorsal row are about twice the diameter of those of the ventral row, 

 decreasing in an orderly fashion. There are two membranes on the 

 club, a broad dorsal one originating some distance proximal to the 

 basal suckers and a ventral narrow one originating at the basal suckers. 

 Both extend to the tip, the dorsal membrane contracted and hence 

 coiling the club. 



