of Edinburgh, Session 1884-85. 
299 
Hab. Japan; purchased in the market at Yokohama. Three 
specimens, 1 $, 2 <j>. 
Sepia Idensis, Hoyle. 
Sepia fciensis, Hoyle, Ann. and Mag. Nat. Hist. ser. 5, vol. xvi. p. 194, 
1885. 
The Body is narrow, widest anteriorly, and tapering gradually 
backwards : the fin is narrow, less than one quarter the breadth of 
the body, widening a little behind ; it commences 1 millim. from 
the anterior margin and extends to within 2 millim. of its fellow 
behind. The mantle-margin is prominent dorsally and slightly 
emarginate ventrally. The siphon does not quite extend to the 
bases of the arms. 
The Head is broad, and the eyes rounded and prominent. 
The Arms are subequal, the order of length being 4, 3, 2, 1 ; 
they are very short, about one-third the length of the body ; the 
first and second are conical, the third flatter, with a slight ridge 
externally, and the fourth broad and flat with a distinct crest. The 
suckers are in four series throughout, small, spheroidal, and not very 
oblique ; the horny ring is smooth. The hectocotylus is not 
developed. The umbrella is evanescent, extending at most only up 
to the second row of suckers : the buccal membrane has five points 
and is rounded dorsally ; the spermatic cushion is but slightly 
developed. The outer lip is thin and grooved longitudinally, the 
inner thicker and papillate. 
The Tentacle is as long as the head and body ; the stem being 
slender and indistinctly three-sided. The club is very slightly 
expanded ; a protective membrane, grooved obliquely on the dorsal 
aspect, is situated on the outer margin, and there is a web on the 
internal side. The suckers are in four or five series, which are 
slightly larger towards the inner margin ; the horny ring presents a 
few acute teeth. 
The Surface is smooth throughout. 
The Colour is a dull reddish grey above, yellowish below. 
The Shell is a very elongate oval in outline ; the chitinous margin 
is very narrow and extends only slightly over the dorsal surface , 
which is finely granular and marked by the divisions between the 
loculi : the ventral surface is somewhat elevated and marked by a 
VOL. XIII. 
x 
