418 A. E. Vemll — North Anierican Cephalopods. 



beneath than laterally. Fins large, lateral. Siphon witli an internal 

 valve, in both sexes; connective cartilages oblong, with a central 

 groove, fitting a linear ridge, on each side of the mantle; these do 

 not extend to the edge of the mantle. Arms webbed for more than 

 half their length, except between the ventral arms ; second ])air, in 

 the male, and some females, with two or three much enlarged suckers 

 near the middle. The suckei's of all the arms are relatively larger in 

 the male than in the female ; dorsal arms of the male alike ; their 

 basal suckers are larger and more crowded than in the female ; no 

 other evidence of hectocotylization could be found. 



Stoloteuthis leucoptera Veniii. 



Sepiola leucoptera Verrill. (See p. 347.) 



The largest specimen hitherto observed is an adult male, from 

 station 947, in 312 fathoms. This differs but very little from the 

 smaller male already described and figured (p. 348, PI. XXXI, fig. 5), 

 but it has, on the tips of both ventral arms, four rows of small 

 suckers, w^hile all the others, of both sexes, have but two rows, even 

 to the extreme tips. The suckers on all the arms of this specimen 

 are decidedly larger in proportion than on the females of nearly 

 equal size, and the group of larger suckers on the second pair of arms 

 is represented by one very large one, on each arm. More than half 

 the female specimens also have the corresponding suckers much 

 enlarged, but perhaps not so much so as the males. The large males 

 appear to show some evidence of hectocotylization, in having the 

 suckers near the base of both dorsal arms larger and more crowded 

 than they are in the I'emales, and the portions of the web bordering 

 these arms appear to be somewhat thickened or swollen, a feature not 

 present in the females. But I could detect no difference in the struc- 

 ture of the two doisal arms, nor in the two ventrals. The tentacular 

 arms are much swollen at base, especially the right one, while the 

 club is narrower than the average width of the arm ; just at the base 

 of the club, along the upper edge of the ' wrist' there is a prominent 

 free lobe or crest. 



In alcohol, the integument appears very thick and rather soft. In 

 life there appears to be a thick, gelatinous, transparent layer, outside 

 the stratum containing the chromatophores. 



The large male described above, in alcohol, is 40""" long, from end 

 of body to tip of lateral arms ; breadth of body, 22 ; breadth of head, 

 20 ; breadth across extended fins, 38 ; length of lateral arms, from 

 beak, 15'"'". 



