106 BULLETIN OF THE 
Arms considerably longer than the head and body, not very stout, com- 
pressed, bearing a single crowded row of large whitish suckers, which are 
mostly separated by spaces less than half their diameter, margins of suckers 
soft and much thickened. The three lower pairs of arms are very nearly equal 
in length and size; the dorsal ones are a little shorter and smaller. A thin 
web unites all the arms for about one fourth of their length, and runs up along 
their sides for about half their length. The male has the third right arm 
(Plate V. fig. 1) hectocotylized at the tip; the modified tip is preceded by 45 
suckers, and is bordered ventrally by a broad membrane, having a white groove 
along its inner surface ; the terminal organ (Fig. 1*) consists of a small, ovate- 
triangular, fleshy disk, with its inner surface slightly concave and finely wrin- 
kled transversely, and terminating proximally in à small point. 
Color dark purplish brown, darker purple beneath. Chromatophores small 
and densely crowded. 
The female is considerably larger than the male, and has the warts over the 
back and around the eyes relatively smaller, but of the same character. The 
arms appear to be larger than those of the male, but this is probably due to 
the fact that the male has become more contracted by the stronger alcohol in 
which it was placed. 
This female specimen illustrates well the uselessness of the attempts to 
divide the species of Octopus and allied genera into groups or sections according 
to the relative lengths of the arms, as J. E. Gray and others have done, for in 
this and many other cases the proportions of the arms of the right side would 
throw it into one section ; those of the left side into another, The male would 
have to be put into a third section. 
MEASUREMENTS IN MILLIMETERS, 
No, 12. No. 18. 
Male, Female, 
Right side, Left side, 
Total length. + no ceni ora 202. 360. 
End of body to centre ofeye . . + . . 58. 100. 
บ อ ส น of body A 6 ห ห ภา EP 55. 65. 
Breadth across eyes . . PVG OT 49, 
Length of dorsal arms, from fue - 135. 255. 260. 
Length of 2d pair of arms . . . . « . 155, 260. 235. 
Length of 3d pair of arms . a . . . + 225. 240. 
Length of hectocotylized arm . . . +. . 130. 
Length of modified tip . . pe « ง « 4.5 
Length of ventral arms . ........... 145. 210. 225. 
Greatest breadth of lateral arms . . +. . 12. 18, 18. 
Diameter of largest suckers. . . . . . 3. D. 5. 
SPECIMENS EXAMINED. 
Specimens 
No. Stat. Locality. Fath. When rec'd. No. Sex. 
12 305, N. Lat. 419 83’ 15", W. Long. 65° 51’ 25” 810 1880 Qum 
312, N. Lat. 399 50’ 45”, W. Long. 709 11 Ue Tue 
