192 Records of the Indian Museum. (VOL. 2k, 
Specimen number ... M 8192 M £248 M S244 
mm. mm. mm. 
Ist right arm ot ha 57 110! Oi 
ond ae cae a 8o less tip. 141 184 
ardent. a ne 80 127 156 
Ath ys . mutilated? 77137 172 
PStylett: ame z 3 63 130 150 
2nd ,, 3 Pes ee 98 147 210 
Buca. 5 ae ne 62 less tip. 168 223 
4th ,, aE as - 82 163 182 
Hectocotylus ; eels 2°50 DONS 8 
Length of funnel 6 12 15 
Diameter of largest sucker eS ee 50 4 5 
Distribuiion.—Indo-Malayan and Insular Pacific Regions. 
Type. artis Museum, a male from Manila. 

Polypus macropus (Risso). 
Octopus macropus, Risso, Ast nat. Europ. méditerr., P- 3; pl. iy 
(1826) ; Hoyle, ‘ Challenger’ Rep. XVI (Cephalopod: a), p. 95 (1886) ; 
Ortmann, Zool. Fahrb., III, p. ce pl. 21 (1888) ; Jatta, 7 Csfalepode 
viventi nel Golfo di Napoli, p. 117, pls. 6, 23, 24 (1896); Joubin, 
Bull. Soc. Zool. France, oan p- 90 (1897) ; Octopus cuviert, d’Or- 
bigny-Férussac, Céphalopodes acétabuliféres, jo shea a to eal, 27 
(1838); Appelléf, K. Svensk. Vetensk. Akad. Handl., XX1, p. 6, pl. i 
(1886) ; Polypus macropus, Hoyle, Bull. Mus. Comp. Zool., XLII, 
p- 195 (1904); (2) Hoyle, Trans. Linn. Soc. Zool., XXXI1, pp. 36-37 
(1907) ; W alker, Abh. ad. IT. Kl. d. k. Ak. d. Wiss., 111 Suppl.-Bdi, 7 
Abh., p. 6 (1910); Berry, Proc. Acad. Nat. Sc1. Phil., pp. 389-90 
se 2a). 

3 Indian Seas (Dr. Armstrong)—One 6. 
429 Persian Gulf (R. Hugh Butler)—One ; 
305 Singgor a, Talé Sap, Gulf of Siam, 1-11-1916 (NV. Annandale)— 
One a 
Specimen M *?* agrees closely with a male example from 
Naples Bay, purchased by the Dublin Museum from the Zoological 
Station at Naples. The loose skin, which forms many thick rolls 
on the nuchal region is a remarkable feature, and both specimens 
have a closely noduled surface with minute chromatophores, and 
a long funnel indented laterally at the apex so as to produce a lip 
on the dorsal and ventral walls. The example M “1 has a ventral 
median groove of which there is no trace in thie Nantes specimen. 
The main characters of M *?° are, briefly, arms about seven times 
the length of the mantle; the first pair the thickest and longest, 
and the only arms with enlarged suckers; umbrella about one- 
fifth of the arms and continued on their outer margins, highest 
dorsally ; mantle-opening 6 mm. behind the eye and on a level with 
its lower edge; siphon long, two-thirds of it above the level of the 
eye, and reaching to within 3 mm. of the edge of umbrella; sperm 
canal striated faintly in proximal part, smooth elsewhere ; termi- 
nal organ of hectocotylized arm very small®, and narrower than 
the part of arm immediately preceding it; surface more or less 

1 In course of regeneration. 
2 In the Naples specimen, the terminal organ measures 6°50 mm. on an 
arm of 140 mm. 
