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 twenty inches 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 (Plate VIII., fig. 1) are broad rhomboidal, the posterior extremity produced into a blunt, but well developed, “tail;” the anterior lateral margins somewhat concave, and produced beyond the insertion, but the produced portion rounded.

The jaws (Plate IX., fig. 1, 2), when in position, as shown in Plate IX., fig. 3, 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 gradually 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 alæ 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; succeeding this notch, and just on the anterior edge of the alæ, is a broad prominent lobe or tooth, the edges sloping from this to a depression, whence they rise again before rounding off.

The teeth of the radula are in seven rows, with on each side a marginal row of thin unarmed plates. The teeth are a light horn colour, but become darker in spirit. Those of the median line have three fangs, all truncate (see Pl. IX., fig. 4), the centre one much the largest, the laterals are slightly turned outwards; those of the sub-median line have two fangs, the inner one being the largest and turned towards the median tooth, while the outer one is slightly inclined towards its sub-lateral

neighbour. The teeth of the sub-lateral line are acute, stout, and much curved towards the sub-median. The laterals are slighter than the last, acute, and also curved inwards.