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Proceedings oj the Royal Society 
situated anteriorly to the middle of the fin. The mantle-margin 
presents a triangular process in the mid-dorsal line and is deeply 
sinuate ventrally. The siphon is short and bluntly conical. 
The Head is short and not so broad as the body ; the eyes are 
comparatively small and have a bracket-shaped auricular crest 
behind and a minute pore in front of them. 
The Arms are unequal, the order of length being 3, 4, 2, 1, and, 
on the average, rather more than one-third the length of the body ; 
the first are the most slender, and have the dorso-median angle 
raised into a prominent keel ; the second have only a faintly-marked 
angle ventro-laterally ; the third have a broad web externally, 
passing over at the base into one which extends up the dorsal 
aspect of the ventral arms. The suckers are arranged in two series, 
pedunculate, very oblique, and rather larger on the lateral than on 
the other arms; the horny ring has about nine short, close-set, 
square-cut teeth on its distal side, and is smooth on the proximal. 
The hectocotylus was not observed. The buccal membrane has five 
points, each of which hears two or three small suckers, the two ventral 
points are rounded off; just within the ventral margin is a small 
papilla surrounded by two elevated rings, probably for the reception 
of spermatophores. Both the outer and inner lips are folded. 
The Tentacle is faintly three-sided and shorter than the body, one- 
third of its length being taken up by the club , which is expanded 
and triangular in section ; there is a protective membrane on either 
side and a weh externally; in the centre are eight large suckers , 
three times the diameter of the lateral ones ; at the proximal end 
are about nine suckers, gradually increasing in size, and at the 
distal end more than twenty rows arranged in four series, gradually 
diminishing. The largest suckers are scarcely at all oblique, and 
have the margin cut up by radial grooves into a number of small 
papillae, an arrangement also found on the outer margin of the 
lateral suckers, hut not in the terminal ones. The horny rings of 
the largest suckers are smooth; those of the lateral bear about 
twelve long distant teeth on their outer margin ; those of the terminal 
suckers are similarly armed. 
The Surface is smooth. 
The Colour is pinkish yellow, with purplish chromatophores. 
The Gladius has not been extracted. 
