REPORT OF COMMISSIONER OF FISH AND FISHERIES. [ 186 ] 
The jaws (Plate XLII, fig. 3) have rather blunt, slightly incurved 
tips, with the angle at the bases of the cutting edges round and without 
any distinct notch. The odontophore (Plate XLII, fig. 4) has a median 
row of large, acute teeth with broad bases, without lateral denticles; 
the inner lateral teeth are much smaller, with curved, acute-triangular 
points; outer lateral teeth longer and more acute; marginal plates 
large and distinct. 
Siphon large, tapering, capable of being bent in all directions, so as 
to be used for swimming either forward, backward, or sideways, accord¬ 
ing to its direction. 
Arms subequal, relatively short, stout, tapering to slender points, 
connected for about one-third of their length by a web, which extends 
as a narrow membrane along their margins to near the ends. Suckers 
small, not crowded, alternating pretty regularly in the two rows; in 
the original type-specimen, which was not full-grown, the arms of the 
first pair each had about sixty-five suckers; those of the fourth pair 
about sixty. In a larger example (?) the dorsal arms have about 94 
suckers; the third pair about 100; the ventral ones about 90. 
In the male, the right arm of the third pair has its terminal portion, 
for about a third of its entire length, modified for reproductive purposes 
into a large spoon-shaped organ (Plate XLI, fig. la), broadly elliptical 
in outline, with the sides incurved, and the end somewhat trilobed; inte¬ 
rior deeply concave, with ten to twelve, and occasionally, in the largest 
examples, thirteen elevated transverse folds; at the base, there is a fold 
bent into an acute angle, the apex directed forward, leaving a deep V 
shaped sinus behind it, which is a continuation of a shallow groove, 
formed by a thickening of the web along the lower side of the arm, and 
terminating midway between it and the fourth arm. At the end, the 
arm terminates in a small conical tip, between the two broadly rounded 
lobes of the spoon-shaped organ; at the base of this organ there is a 
slight constriction; the basal portion of the arm bears 30 to 37 suckers, 
like those on the other arms. The modified portion of the arm is con¬ 
siderably longer than the distance between the constriction at its base 
and the interbrachial web, and about equal to one-half the total length 
of the part which bears suckers. The corresponding arm on the left 
side is of the ordinary form, and has, in medium-sized examples, about 
51 suckers. 
.The female differs but little from the male, externally, except in lack¬ 
ing the modification of the third right arm. 
Some of the larger females were filled with mature eggs. These are 
large and rather numerous, occupying a large part of the interior of the 
body. They are enclosed in long-pyriform sacs, with the small end taper¬ 
ing to a filiform point, by which they adhere. 
Length of the original male specimen, in alcohol, exclusive of the 
arms, 44 mm ; breadth of the body, 31 mm ; between eyes, lS mm ; length 
of arm, of the first pair, from mouth, 57 mm ; from mouth to edge of web, 
