298 
Proceedings of the Royal Society 
very slender tips. The suckers seem to be normally in four series, 
but in some cases the arms are so compressed that they seem to be 
in only two, especially at the proximal extremities of the first and 
second arms ; they are globular, slightly oblique, with a small aper- 
ture and smooth horny ring. The hectocotylus occupies the distal 
half of the left ventral arm ; the suckers are normal up to the twelfth 
row, after which the arm widens and has a median groove from 
which about twelve shallow grooves pass outwards on either side, 
separating raised portions, each of which bears a minute sucker on 
the dorsal side of the groove. The umbrella is present only between 
the second and third and third and fourth arms up to the fourth 
row of suckers. The buccal membrane is well developed and has 
the usual seven points ; in the female there is a deeply grooved 
spermatic cushion. The outer lip is thin and smooth, the inner thick 
and papillate. 
The Tentacles are somewhat longer than the head and body, 
very slender and somewhat flattened. The club is flattened and 
expanded ; along its outer margin is a very narrow membrane, and 
along the median edge, at some distance from the cupules, is a 
broad web, marked on the dorsal aspect with fine parallel shallow 
oblique grooves ; along one margin it bears three or four series of 
small pedunculated suckers , whose horny rings bear very numerous 
and acute teeth. 
The Surface is smooth. 
The Colour is a dull purplish grey above, ochre with purple 
chromatophores below. 
The Shell has a narrow elongated oval outline , somewhat pointed 
in front and tapering gradually backwards ; the chitinous margin 
extends about one-third across the dorsal surface , which shows the 
boundary lines of the loculi clearly as brown striae, and is very 
minutely roughened ; the ventral surface is elevated, so that the 
shell is thick in proportion to its breadth, a narrow groove runs 
down the centre ; the last loculus occupies one-fourth of the surface, 
and is bounded posteriorly by a shallow open curve. The posterior 
extremity is a very flattened irregular cone, to the apex of which 
the spine is attached ; the inner cone is very shallow and its open- 
ing is some 4 millim. from the margin or the outer cone. The spine 
is long, straight, and points directly backward. 
