40 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
beneath the integument, are four or five eye-like bodies, which are presumably 
phosphorescent organs: the largest of these is situated just in front of and be- 
low the ocular opening; it forms the antero-lateral prominence in the outline 
of the head and is readily seen through the semi-transparent skin; it is oval 
in form, the length being nearly equal to the diameter of the lens; the others 
are difficult to see until the skin has been removed. Surrounding the mouth 
is an extensive buccal membrane, of a purplish color, which is attached to the 
inner surface of all the arms, except the ventral pair, to a height of about 
3 mm. from their bases. ; 
The Arms are sub-equal and about two-fifths the length of the body. The 
first arm (Plate 7, Fig. 1) is provided on the inner aspect proximally with 
about eight pairs of moderately large suckers, then four pairs of gradually 
diminishing hooks, and beyond these a double series of small suckers, grad- 
ually diminishing and reaching to the tip of the arm. The form of the 
hooks is shown in Figs. 8and 9. On the dorsal margin the middle third of 
the arm is occupied by a narrow membrane: on the ventral margin is a web 
nearly half the breadth of the arm, which is cut by a series of notches into 
lappets large in the middle third of the arm and gradually diminishing towards 
the apex. On the external aspect of the arm isa narrow web for about its 
third quarter. 
The second arm (Fig. 2) is of almost the same length as the first : it is 
armed with about five pairs of suckers and then three pairs of hooks, beyond 
which is a single small sucker ; there is no web on the dorsal margin, but on 
the ventral is a broad web which has a wavy margin in the proximal half, 
becoming somewhat more deeply notched towards the apex : on the external 
aspect is a narrow web for about the distal third. 
The third arm. (Fig. 3) is of the same length as the second : it is provided 
with three pairs of suckers and then six or seven hooks about the middle of its 
length, the distal portion being unarmed : on the dorsal margin is a very nar- 
row web for the proximal two-thirds and on the ventral a broad web, wavy at 
first and then scalloped : there is a broad web for more than the distal half on 
the outer aspect. 
The fourth arm (Wig. 4) tapers more abruptly, especially in the proximal 
portion, than the others; the dorsal aspect is hollowed, where it lies against 
the tentacle, and the dorso-external angle is produced into a thin web which 
joins the root of the third arm: it passes outside the tentacle and expands 
distally into a web, comparatively broad in the middle third of the arm and 
becoming evanescent towards the tip. It possesses neither hooks nor suckers. 
The tentacle is about as long as the body. It is at first slender; then follows 
a swollen portion, after which it is slender again, and afterwards becomes rhom- 
boidal in section, that angle of the rhomb which is directed outwards being 
rounded off, whilst the other three are pronounced. From this point it tapers 
gradually to the tip, there being no expanded club, The sucker-bearing face 
occupies only a few millimetres of the extreme tip of the infero-internal face. 
There are two moderate-sized suckers proximally with smooth rings sueceeded 
