307 
of Edinburgh, Session 1884-85. 
back of the neck, and of a long linear ridge extending up to the 
margin, which fits into a shorter groove on the base of the siphon ; 
this is broad, short, and conical, has a thick suspensory ligament, 
through the skin of which two muscles may be distinguished, and a 
distinct valve. 
The Head is as large as the body, rounded at the sides and 
flattened above and below. The eyes appear to have been enormous, 
one is distended and protrudes from its orbit, whilst the other is 
shrivelled. There is no auricular crest nor preocular pore, but behind 
each eye is a white papilla. 
The Arms are about equal in length to the head and body 
together ; the dorsal are the shortest, the other three pairs subequals, 
the order of length being 3, 4, 2, 1 ; they are quadrilateral, with 
rounded angles externally, with two slightly raised ridges internally, 
on which the suckers are situated; they taper gradually to very 
slender tips ; the third pair have a delicate narrow web along the 
third quarter of their outer aspect. The suckers are in two series 
throughout; they are small and distant along the proximal third 
(the webbed portion) of the arms, then larger and closer, and finally 
minute and very closely set towards the tips ; they are set trans- 
versely on short conical peduncles, spheroidal with a swollen band 
round the face. The horny ring is smooth proximally, distally it 
bears about five close-set, broad, bluntly rounded teeth. JSTo trace 
of a hectocoiylus could be found. The umbrella is found only 
between the dorsal, dorso-lateral, and lateral arms ; it takes origin 
from the' sucker-bearing ridge and extends about one-third up the 
arm. The buccal membrane is broad and somewhat contracted over 
the mouth ; it has the usual seven points, but they are very blunt 
and indistinct ; it is united by three ligaments with the web between 
the dorsal and dorso-lateral arms, by a ligament with the inner side 
of each ventro -lateral arm on its ventral aspect and by another to 
the inner surface of each ventral arm, there being altogether seven 
ligaments. The membrane bears no suckers; its inner surface is 
much creased and folded. The outer lip is very thin and smooth, 
and hidden between the creased integument of the buccal membrane 
and the inner lip , which is thick and marked with irregular radial 
grooves. 
The Tentacles have been removed ; the stumps which remain are 
