224 Records of the Indian Museum. Vor. OGhie 
specimen are smooth. Some suckers from the buccal membrane 
show smooth rings, others have notches or short blunt teeth. 
The hectocotylus is placed on the proximal half of the left 
ventral arm. ‘The first three or four rows of suckers are normal, 
and are followed by about six pairs of very minute suckers on the 
ventral margin, about four pairs being placed on an excavation 
on the corresponding part of the dorsal margin of thearm. In the 
smallest male, M *4°*+, this excavation is slight, but a deep round 
cavity is formed on the older specimens. The spermatic pad is 
broad and very papillate. Colour, slate above and buff-pink 
below; the chromatophores are all small and usually dark; a few 
look like white spots but are pale blue when examined with a lens; 
although very dense on the dorsal mantle they form no bands or 
other definite markings. The fins, which have fewer chromato- 
phores on their ventral surface, are usually broad and thick but are 
sometimes closely adherent to the mantle. The surface is generally 
smooth but often about six crescent-shaped wrinkles occur at the base 
of the fins along either side of the dorsal mantle. The cuttle bones 
of seven specimens examined all show a callosity on the inner cone, 
and their form agrees closely with the illustration of d’Orbigny (pl. 
25, fig. 4), and also closely resembles that of the shell of S. zndica, 
d’Orb., which Joubin (/.c., pp. 21-28) thinks is very likely iden- 
tical with the present species. Hoyle has pointed out that 
S. indica is called S. blainvillet in d‘Orbigny’s illustration (pl. 21, 
figs. 1, 3, 4). The specimens M “+*-and M >) with mane 
lengths of 44-59 mm., have both much smaller spermatic pads, and 
in the shell the callosity of the inner cone is only partly developed. 
The smallest has thinner fins than the others; probably this may be 
attributed to its youth. Measurements of some of the specimens 
are appended :— 
Specimen number M 728 M 8287 M 8288 M 8280 



mm. mm. mm. mm. 
Dorsal mantle-length ; 105 109 125 170 
Ventral mantle-breadth = 54 60 JO. 68.102 
Fin maximum i II Il 7 18 
Breadth of head nae ae 37 {1 44 60 
Ist right arm vi 43 mutilated. 50 61 
2G. ea) ms 43 50 45 55 
ard 5) 43 49 60 49 59 
AtM sy 45 de oat 48 65 57 60 
Tentacle ay 7 [10 IQI » 128 
Club be aa 25 33 
Sepiostaire :— 
Specimen number M 2155 M 3228 M 8252 M 8262 M £257 M £269 M 2004 
mm. mm. mm. mm. mm. mm, mm. 
Total length 42 58 80 110 110 173 iy 
Breadth 17 23 25 35 35 60 36 
Length of spine Ca3 4 
Index ! 40 Ke) Ass eth) PT) 22 23 18 
Distribution.—-Japan, Java, Indian Ocean. 


| The index is the pinion of the last loculus plus ihe total length of the shell 
when divided into one hundred parts. See Hoyle, ‘ Challenger’ Rep., XVI 
(Cephalopoda) , p. 123. 
