242 Records of the Indian Museum. [Vor Sens 
tacles are only represented by portions of stems. The arms are 
about 2 mm. in length, and the distance from the dorsal mantle- 
margin to the fork between the dorsal pair is 2 mm. The breadth 
of the head across the eyes is about 250mm. The specimen has 
been preserved in formalin. 
The following are the principal measurements ‘of specimen 
M *? :— 
mm. 
End of body to dorsal mantle-margin ,,, on perentee 
Breadth of mantle ay, oe be aed 
Pi ,, head across eyes oo = Te) 
Ist right arm sg te ane ve Bee 150) 
andes = o> 55 on ee 8 aut 
3rd 9 ” see eas BoA sieve eee 4 
4th oe) ”) tae prols 565 ayete eee 5 
Length of tentacle ix - ai Patee2i2 
Aa 5p. Cllitloy =. - son, 
Distribution.—North Atlantic (Verrill, 1885); Indian Ocean 
(Chun); between Marion Island and the Crozets (Hoyle, 1886) ; 
North Pacific (Hoyle, 1904); Antarctic (Hovle, 1912). 
Vertical Range.—437-1600 fathoms (Pfeffer, 1912). 
Family HISTIOTEUTHIDAE. 
Stigmatoteuthis japonica, Pfeffer. 
Stigmatoteuthis gaponica, Pfeffer, Plankton Exp., (Oegopsida) pp. 284-5 
(1912); Callzteuthis reversa, Hoyle, ‘ Challenger’ Rep., XVI (Cephalopoda), 
pp. 183-4, pl. 33, figs. 12-15 (1886). 
M £182 ‘Investigator’ station 374: 2-iv-1907, Andaman Sea, 11° 37’N., 
95° 57’ E., 28 fathoms-—One. 
The first three pairs of arms have a row of luminous organs 
on the ventral margin of their dorsal surface. Of these there are 
eight on the first arm, eleven to twelve on the second, and nine 
on the third. On the latter pair a short, strong keel attaining 
3mm. in width, is developed on the central third of the arm along 
the line of the luminous organs. The fourth arms possess three 
rows of luminous organs for more than half their length, two of 
which persist towards the tip where a single row containing four 
terminates the series. About twenty-nine organs are present on one 
of these arms. Seventeen luminous organs surround the right 
eye-opening. ‘The left eye has only six organs. The mantle- 
margin has a well-defined row of organs all round its circum- 
ference, except on the median dorsal surface, where a space of 11 
mm. is ornamented by a solitary organ in the exact median line. 
On the ventral mantle there are about sixteen transverse rows of 
organs, and about six similar rows occur on the ventral sur- 
face of the head; eight organs form a low arch above the siphon. 
Very few luminous organs are present on the dorsal surface of the 
head and mantle. ‘The arms have slight protective membranes 
and their suckers are furnished with smooth rings, except at the 
distal portion of each arm, where the rings have five to eight 
