1916.] A. I, Massy: Cephalopoda of the Indian Museum. 235 
orly. Sculpture: a few papillae are usually present on the dorsal 
surface of the mantle, and sometimes extend to the head, but 
never to the fins or ventral surface. Colour in alcohol, buff with a 
variety of bluish-slate and purple-pink markings. The innumer- 
able chromatophores are very small and dark on the dorsal 
surface and are usually reddish ventrally. Very few chromato- 
phores occur on the ventral surface of the fins. The row of dark 
ornamental spots or ocelli along the base of the fin shown in the 
illustration of d’Orbigny (pl. 20) is present only in males of a 
certain size. Among the specimens M 2°42" eight males with 
mantle-length of 26-35 mm. show no ocelli, which are, however, 
distinctly marked on four males with mantle-length of 32-37 
mm. As regards the specimens M *°°*%1°* thirty-one males with 
mantles of 33-40 mm. show the ocelli and the remaining twelve 
males, which are without them, have a mantle-length of only 
20-32 mm. The oceili are always largest at the posterior end of 
the mantle, and in very small males appear first at thisend. They 
are usually pear-shaped with the pointed end innermost, and may 
be 7 mm. by 2 mm. in large specimens. Anteriorly they become 
rounder. A male with mantle-length of 36 mm. shows five ocelli 
on each side, one with mantle-length of 46 mm. has seven on each 
side, and one with mantle of 53 mm. has nine on each side. The 
Penang specimen (M *+°) shows a deviation from this rule by 
exhibiting eleven strongly-marked ocelli on either side of a mantle 
of 43 mm. in length. The ocelli, which show no iridescence, are 
situated in the skin beneath the outside layer, and do not penetrate 
to the muscular layer. If a portion of epidermis is examined with 
a high power, the ocelli appear as opaque, white, oblong masses, 
and are thus in sharp distinction to the round dark chromatophores 
none of which approach them in size. In light coloured speci- 
mens the ocelli are pinkish’, and small dark chromatophores are 
sprinkled over their surface as elsewhere. In the female the ocelli 
are always absent, and they are also wanting in a few males large 
enough to possess them (M “1+, M #772 and M 522°), but these latter 
are either faded or in bad condition as regards the epidermis. Many 
of the specimens in the collection possess no date of capture, but 
there is evidence to show that examples with ocelli were taken in 
the months of January (1890 and 1908, in both hauls ocelli bare- 
ly visible); March (1900, very distinct) ; April (1870, faint, 1904 
and 1912, very distinct); November (1913, very distinct); and 
December (1912, well-marked). A male S. oyvnata in the Paris 
Museum exhibits ocelli along the sides closely resembling those 
of male S. inermis. A female S. ornata in the same collection 
has unfortunately become suffused with black so that it is not 
possible to see if the ocelli are absent. 
Hight males (M *°*3°*) with mantle-length of 30-37 mm. and 
six males and one female (M °°**3**) also small, exhibit a beauti- 



‘ It is often necessary to hold a specimen up to the light, or allow it to 
become dry, in order to discover the ocelli. 
? A specimen taken in December, 1888 shows no ocelli. 
