HOYLE: REPORTS ON THE CEPHALOPODA. Li 
smooth surface. The arms are given by Gould as being in order of length, 1, 
2, 3, 4; but it would appear from his figure that there is no great disparity 
between them and that they might with propriety be termed sub-equal. It 
may further be remarked, in this connection, that in Gould’s specimen the 
arms were contorted by the contraction of the mantle, under which circum- 
stances accurate measurements are very dificult. In all these from the 
“Albatross”? Expedition the arms are sub-equal; in some one is a trifle longer, 
in others another. In the male specimen (No. 7949), in which the total length 
is 8.5 cm. and that of the longest arms 6.5 cm., the heetocotylized arm is only 
4.5 cm. long and the modified extremity only 4 mm. This is of the usual 
form; the centre of the spoon-shaped portion forms a rounded. elevation with- 
out any transverse ribs (Plate 4, Fig. 5). The specimen numbered 7950 differs 
from the last (7949) in the paler dull-gray color, but this is possibly due to 
some difference in the mode of preservation. The body is distended and 
wrinkled, and much of the epidermis is stripped from the arms. The proximal 
four suckers are in two rows, not in one, but I am not at all sure of the value 
of this character. 
The radula presents a noteworthy character in the way in which the lateral 
denticles of the median tooth occupy successively higher positions as we pass 
backwards in the radula. There is thus produced a serial repetition which is 
completed in about five teeth (Plate 5, Fig. 1). 
Specimen No. 7954 is small (about 4.5 cm. in total length), but it seems to 
me also to belong to this species. It is a good deal more contracted and harder 
in consistency, and more ruddy in hue. The only difference on account of 
which I should be inclined to separate it is the existence of a very small pale 
wart above each eye, but it is so small and the skin is a good deal wrinkled 
round about, so that it appears to me too insignificant a character to outweigh 
the numerous points of resemblance. 
14. Polypus tonganus ? 
Octopus tonganus Hoyle, '86, p. 83, Plate 8, Figs. 1, 2. 
Habitat. — Pacific Ocean, between Columbia and Mexico; no more precise 
locality. Two specimens. No. 8040. [H. 34, 35.] 
The larger, a very flaccid and mutilated specimen, presents no characters by 
which it can be distinguished from the species discovered by the “Challenger” 
at Tongatabu. The identification is a little uncertain because the “ Chal- 
lenger”” specimens were in a state of extreme contraction and the surface 
considerably injured by mutual pressure. 
One specimen is about 20 em. in total length, the other about 6 cm. 
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