254 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 thaj; of A. Harveyi, which 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 cm in breadth, but when sketched by 

 Dr. J. B. Holder its breadth was 71 cm ; its length, from posterior tip to 

 lateral insertions, 48.3 cra ; from tip to end of lateral lobes, Gl cm . 



The length of the body and head together, when fresh, was about 

 289 cm (9.5 feet), but when measured by me it was about 218 om . 



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 cm (11 feet) 

 long and 43.2 cm (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 sub ventral 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 2o mm (1 inch) 

 in diameter, with the aperture 15.5 mm (.62 inch) across; the denticles on 

 the outer border of the marginal ring were broad-triangular, acute, and 

 strongly incurved, much larger thau 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 margiu, this, in 

 the smaller ones, often being without any distinct denticles whatever; 

 the horny rings are very oblique and the aperture eccentric. Suckers 

 of this kind probably originally occupied the entire length of the ventral 



