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MUSEUM OF COMPARATIVE ZOOLOGY. 121 
Octopus bimaculatus VeRRILL, sp. nov. 
Plate V. Figs. 1, 1a. Plate VI. 
Size moderate, body relatively large, elongated pyriform, enlarged poste- 
riorly, somewhat depressed in alcoholic specimens. Upper surface everywhere 
covered with prominent, unequal, raised warts, usually conspicuous in _pre- 
served specimens, except in those which are unusually flaccid, in which they 
sometimes become low, rounded, or flattened, but do not entirely disappear. 
On the ventral surface the warts are much smaller and less conspicuous. Head 
large, not so broad as the body, from which it is separated by a slight constric- 
tion ; sides of the head about the eyes prominent. Eyes large. Upper sur- 
face and sides of the head conspicuously warted like the body, or more coarsely 
than the body ; above and a little behind the eyes there is one large, conical, 
warted cirrus ; in front and around this, above the eye, there are numerous 
large, prominent warts, some of them larger than those on the general surface. 
Arms rather long, moderately stout, united at the base for a considerable dis- 
tance by a strong thick web, the upper surface of which is strongly warted, like 
the head and body. The web is much more extensive between the dorsal arms 
than between the ventral ones, usually broadest between the second and third 
pairs. The lower surface of the web and the sides and ventral surface of the 
arms are covered with very numerous, crowded, minute, conical or granule-like 
warts, which often appear to be arranged in small patches or clusters separated 
by smoother, paler, reticulated lines or wrinkles. Arms unequal, the dorsal 
pair considerably smaller and shorter than the others. The second and third 
pairs are very nearly equal in size and length. The fourth pair is a little 
smaller and shorter, but considerably longer than the dorsal pair. The arms 
are rounded trapezoidal toward the base, with the sucker-bearing face broad 
and the dorsal surface well rounded ; the membrane along the sides of the arms 
in continuation of the web is usually narrow and inconspicuous, and can often 
be traced only for a short distance. The suckers toward the bases of the arms 
are large, broad, saucer-shaped, with strong radiating grooves, about thirty in 
number, and with a large and deep central pit. Margin much expanded, with 
two borders, the outer one soft and finely crenulated, the inner one divided 
into lobes by radiating grooves. In some males examined, one sucker within 
the border of the web is very much larger than any of the others on the second 
and third pairs of arms. This enlarged sucker is the twelfth from the base, 
_and in the posterior row on each arm. One male of large size has the cor- 
responding sucker only a little larger than the adjacent ones, but the two pairs 
of lateral arms in the males have ten or twelve suckers (from about the tenth 
to the twentieth suckers) mostly within and near the edge of the web de- 
cidedly larger than the corresponding ones on the dorsal and ventral arms. 
Beyond the edge of the web the suckers rapidly diminish in size, and on the 
distal half become relatively small, and gradually decrease to the very small 
ones which cover the attenuated tips. The large suckers toward the base of 
