1050 CEPHALOPODA. [Dibranchi't. 



earned 144, all about the same size as those on the second pair. 

 As in the case of all animals belonging to this section, each sucker 

 was stalked, the stalk being inserted on the side ; each sucker is 

 strengthened by a bony ring having a number of sharp teeth on the 

 exposed edge. These bony rings are quite white when first taken 

 from a fresh specimen ; but after being in spirit for some time they 

 assume a yellowish horn colour. They are all oblique. 



Tentacular arms are very long and slender, more than six times 

 the length of the fourth (ventral) pair of sessile arms, or of the head 

 and body together. The arm is nearly round, and of equal diameter 

 throughout. The clavate portion is triangular, with a membrane on 

 the posterior angle. A large and irregular cluster of small suckers 

 and tubercles at the base of the club ; this cluster gradually thins out 

 and extends up the arm, the distance between the individual suckers 

 increasing till they are about 20 in. apart ; they then occur at regular 

 intervals, a pair, sucker and tubercle, all up the arms. The larger 

 suckers on the club are arranged in two alternating rows, with smaller 

 intermediate marginal ones on each side. 



The head is long, and of equal circumference, save a little behind 

 the centre of the eye, where the cephalic cartilage causes a distinct 

 prominence. The eye is prominent, with a well-developed lid and 

 anterior sinus. 



The body is somewhat contracted a short distance behind the 

 anterior margin, then it increases in circumference to the centre, whence 

 it tapers to the tail. 



The fins are broad rhomboidal, the posterior extremity produced 

 into a blunt well-developed " tail " ; the anterior lateral margins 

 somewhat concave, and produced beyond the insertion, but the pro- 

 duced portion rounded. 



The jaws, when in position, form a powerful beak, resembling that 

 of some gigantic bird of prey, except that the order is reversed, and 

 in this instance the upper jaw fits into the lower, not lower into upper 

 as is the case with birds. The tips of the jaws are black, which gradu- 

 ally passes into dark brown, and this again into a much lighter shade 

 till the margin is reached, where the brown has quite disappeared 

 and a border of dirty white remains. The palatine lamina is dark 

 brown, becoming lighter toward the margins, which are white. The 

 rostrum is strong, convex, acute, and curved forward, the cutting- 

 edges being concave, not, or but very slightly, notched at the base. 

 The anterior edges of the alse are uneven, being toothed or chipped 

 all along. The lower mandible is very stout, not so much curved, 

 no notch near the tip, which is acute ; cutting-edge straight, with deep 

 notches at the base ; sxicceeding this notch, and just on the anterior 

 edge of the alee, is a broad prominent lobe or tooth, the edges sloping 

 from this to a depression, whence they rise again before rounding 

 off. 



