254 " ENDEAVOUR " SCIENTIFIC RESULTS. 



Sessile arms rather short, the relative order of length 

 visually 3, 2, 4, 1, though subject to some variation ; lateral 

 pairs, however, consistently rather longer than the dorsal 

 and ventral pairs, being as long as or a little longer than the 

 body ; traces of keels present on the outer aspects of the 

 three dorsal arm pairs, but conspicuous only on the third 

 pair. Suckers nearly spherical, in two rows throughout ; 

 apertures very minute ; horny rings smooth ; in the 9 (PI. 

 Ixx., fig. 6 ; Fig. 44) suckers similar on all the arms, smaller 

 near the base, fairly large along the middle, and gradually 

 smaller again toward the extremity. In the d^ both dorsal 

 arms hectocotylised (PI. Ixix., figs. 3-4 ; PL Ixx., fig. 5), and 

 in similar fashion ; basal 6 or 8 pairs of suckers exceedingly 

 small ; these followed by perhaps half-a-dozen pairs of 

 suddenly much larger suckers, which are not, however, so large 

 as those of corresponding position on the other arms in this 

 sex ; suckers toward tip of arms gradually diminishing in 

 size ; in all about 25 pairs readily numerable on each arm 

 without a lens ; outer (ventral) face of each arm of this pair 

 ■equipped with a slightly swollen, pocket-like organ (PI. Ixix., 

 fig. 3), consisting of soft, spongy, colourless tissue of an 

 apparently glandular nature, and borne opposite the 6th-9th 

 suckers of the ventral row ; a little above the middle of the 

 organ a deep, longitudinal groove ; a deeper pocket present 

 between the margin of the gland and the sucker-bearing face 

 of the arm. Suckers on the main portion of the remaining 

 arms of thecf (PI. Ixix., fig. 4) greatly crowded and enlarged 

 (Fig. 43) over the condition seen in the ? , those of the ventral 

 series of the lateral arms appearing a trifle larger than the 

 others. Umbrella, except for the well developed tentacular 

 sheath, rudimentary. 



Tentacles long, slender, 

 varying from two and one- 

 half to over three times the 

 mantle length ; in section sub- 

 triangular, the inner face 

 sharply defined, excavated, 

 and marked by a conspicuous 

 central groove. Tentacle Club 

 (PI. Ixx., fig. 7) elongate, 

 comprising more than 

 one-fourth the total length 

 0.5m^. of the tentacle ; not expand- 



ed, but tapering for the most 



r Jof ^•^•-^T''^ aiMis $ ^^^ gradually, then more 



f 539] portion of oral face of left -t^ , , i . j^y j_ ■. 



tentacle club, highly mai^nified ; suddenly to the extremity ; 



part camera drawing from a usually more or less strongly 



mount in balsam. coiled upon itself ; equipped 



