REPORT OF COMMISSIONER OF FISH AND FISHERIES. [44] 
a rounded or blunt angle. The posterior end is somewhat prolonged 
and acute, but less so than in that of A. Harveyt, wich it otherwise re- 
sembles. One of the figures (Plate X, fig. 2), was made by me several 
weeks after it had been placed in strong alcohol, and had shrunk con; 
siderably ; the other (fig. 1) was made by Dr. J. B. Holder after it had 
been in alcohol only a few days. 
When fresh, the caudal fin was 84 in breadth, but when sketched by 
Dr. J. B. Holder its breadth was 71°"; its length, from posterior tip to 
lateral insertions, 48.3; from tip to end of lateral lobes, 61°. 
The length of the body and head together, when fresh, was about 
289 (9.5 feet), but when measured by me it was about 218°". 
The sessile arms were unequal in size and length, the longer ones con- 
siderably longer than the head and body together. Mr. Harvey found 
that the longest arms, said to be the ventral ones, were 335™ (11 feet) 
long and 43.2™ (17 inches) in circumference at base. When first exam- 
ined by me the ventral arms measured 10.5 feet, and were longer than 
any of the others, but all the rest were more or less mutilated at the 
tips, and several had thus lost a considerable portion of their length, so 
that it is quite probable that originally the subventral arms (or third 
pair) were actually longer than the ventral ones. The circumference of 
the third pair of arms, when measured by me, was considerably greater 
than that of the ventral ones, the former being 11.25 inches, the latter 
10 inches. Hence, I have inferred that the greatest circumference (17 
inches), measured by Mr. Harvey, applies to the third pair of arms. 
The ventral arms have both outer angles bordered by a strong, thick 
marginal membrane about an inch wide. The arms are all more or less 
trapezoidal in form, and taper to very slender tips. When examined by 
me they had already lost nearly all their suckers. A few remained near 
the base of one of the arms of the third pair. These were 25” (1 inch) 
in diameter, with the aperture 15.5" (.62 inch) across; the denticles on 
the outer border of the marginal ring were broad-triangular, acute, and 
strongly incurved, much larger than those on the inner margin. 
Of the detached suckers, I have been able to study with care 18 speci- 
mens from the sessile arms. Part of these are represented only by the 
horny marginal rings. The three largest differ from the rest in having 
the denticles less incurved and more nearly alike all around the margin, 
those on the inner edge being only somewhat smaller and more slender 
than those on the outer margin, while the rings themselves are less ob- 
lique and eccentric. These probably came from the basal half of the 
lateral arms. The other suckers all belong to one type, like those seen 
upon the third pair of arms, described above. They differ, however, 
very much in size, in the number of denticles, and in the presence or 
absence of more or less perfect denticles on the inner margin, this, in 
the smaller ones, often being without any distinct denticles whatever; 
the horny rings are very oblique and the aperture eccentric. Suckers 
of tliis kind probably originally occupied the entire length of the ventral 
