ELEDONE. 485 
counting ventrally from the dorsal surface. ‘The arms are 
long, flexible tapering cones, slightly compressed 
laterally, and closely connected at their bases, to form a 
circular circumoral crown round the Buccal Mass (PI. I, 
fig. 1, Br. app.). The bases of the arms are connected by 
a membranous semi-transparent web which extends for 
about one-fifth of the length of the arm, as an inter- 
brachial membrane. Further along it is continued as 
lateral wings—one on each side of each arm—which 
eradually diminish in size, and towards the distal end of 
the arm can no longer be distinguished (PI. I, fig. 1, JV.). 
This web is characteristic of the family Octopodidae, to 
which Octopus and Hledone both belong. Measuring the 
two dorsal arms and the body of half a dozen specimens of 
Kledone, it is found that the relative length of the arm, 
to the head and body, is 229 mm. to 113 mm. or roughly 
2 to 1. There are about eighty suckers on each arm, 
arranged in a single row. They have no horny ring, and 
thus differ from the suckers in the Decapoda. Also they 
are much shallower, and none are modified into hooks. 
The suckers in Eledone are sessile, but the surface of the 
arm which supports them is raised up beneath each sucker 
into a flexible cylinder which really acts as a stalk, and 
allows it to move freely about. Successive suckers are 
separated from one another by a slight space. It is 
noticeable that when these suckers are applied to any 
surface, they do not keep in one straight row, but become 
displaced laterally so as to give the effect of several 
irregular rows of suckers on the arm. The sucker nearest 
to the mouth is about 3mm. in diameter in a large 
specimen,. and equals in size those about half-way down 
the arm. At first they increase in size working from the 
mouth towards the tip of the arm, and the fifth and sixth 
suckers are the largest which occur—about 12 mm. to 
II 
