200 Records of the Indian Museum. [VoL 2c 
than the ventral pair. The suckers are small, prominent and far 
apart ; none are enlarged in the male. Theumbrella attains to one- 
third or one-fourth of the arms, is lowest ventrally and about 
equal elsewhere. It is continued on the outer margins of the 
arms, but not remarkably so except in the largest specimen. The 
mantle-opening is placed just below the eye. The funnel is much 
fused to the head and reaches to about one-third of the distance 
to the umbrella margin. Two specimens were examined with 
regard to the funnel organ. One is in too bad condition ; but the 
other, M **"*, possesses an oval, somewhat shield-like median 
pad, and two oblong lateral pads of about half the width of the 
median one. It is possible that these may have been joined to the 
median pad at the posterior end. The tip of the hectocotylized 
arm resembles that figured by Hoyle (1886, pl. 7, fig 2) except 
that, as in the examples recorded by Goodrich, the ridges are more 
marked. All the examples are quite smooth and pinkish in colour. 
The chromatophores are very minute, and of various tints from 
yellow-brown to purple-red. The principal measurements are ap- 
pended :— 
Specimen number ae M 315 M 8412 M 1341 M 4348 
mm. mm. mm. mm. 
End of body to mantle-margin 24 25 37 42 
iy Han og VE Pe 29 31 54 60 
Eye to umbrella As 37 40 70 
Breadth of body ae 2 21 30 Ao 
af », head st = 18 20 18 | 26 | 
Ist right arm : tas 1182 96 140 182 
BNE| on ae be wie LM 90 130 201 
UGH Pate ae a ae 112 mutilated. 65 201 
WINE oe a . pF sgl +f 117 192 
TSe, lela, E i ES 93 mutilated. 185 
PNG een hate - ai 130 852 124 168 
Badia ee Fs ss i S22 84 114 172 
Ue oe 1 oh ie es 763 75 122 180 
Hectocotylus a oat - ae 13 
Diameter of largest sucker ah S50 2 1°50 2 
Distribution.—Off Barra Grande, Brazil (type locality) ; Rio 
de Janeiro, Brazil, and North Pacific, east of Japan (Hoyle); Bay 
of Bengal and Andaman Sea (Goodrich); Off the Cocos Islands 
(Hoyle). 
Polypus tonganus, Hovle. 
Octopus tonganus, Hoyle, Diagnoses 1, p. 225 (1885); Prelim. Rep., 
p- 100 (1885); ‘ Challenger’ Rep., XV1 (Cephalopoda), pp. 83-84, 
pl. 8, figs. 1, 2 (1886); Hedley, Mem. Austr. Mus. Svdney, U1, pp. 
520, 550 (1899); Polypus tonganus, Hoyle, bull. Mus. Comp. Zool., 
XLIII, no. 1, p. 17 (1904); Fauna and Geogr. Maldive Laccadive 
Archip., 11, suppl. 1, p. 978 (1905). 
M 726 ‘ Investigator’ station 242: 2-x-1898, Arabian Sea, 17° 27 
N., 71° 41’ E., 56-58 fathoms—One ¢ 

| In bad condition. 2 Less tip. 3 In course of regeneration. 
