296 Proceedings of the Royal Society 
Hab. South of Papua (Station 188), 28 fathoms. Pour speci- 
mens, ?. 
Sepia sulcata, Hoyle. 
Sepia sulcata, Hoyle, Ann. and Mag. Nat. Hist., ser. 5, vol. xvi. p. 192, 
1885. 
The Body is cylindrical in its anterior fourth, then tapering gradu- 
ally backwards, and pointed behind. The fins are one-fifth the 
breadth of the body, commence 2 millim. from the anterior margin 
of the mantle, and approach within 5 millim. of each other 
posteriorly ; the mantle-margin reaches far over the head dorsally, 
and is evenly truncated below. The siphon does not extend up to 
the interbrachial space. 
The Head is broad and the eyes very prominent ; in the only 
specimen it is much retracted into the mantle. 
The Arms are subequal, the order of length being 4, 3, 2, 1 ; 
they are one-third the length of the mantle, and taper gradually to 
slender points ; the first are thin and rounded, the fourth flattened, 
each has a distinct ridge on the outer side, which in the fourth ex- 
pands to a broad membrane. The suckers are in two series in the 
first and second arms, but with a tendency to form four series in the 
others, more especially in the distal portions ; they are pedunculate 
and very oblique, and the margin is marked with meridional grooves 
and has a deep distal notch ; the horny ring is small, smooth, and 
surrounded by a papillate area. The hectocotylus is present along 
three-fourths of the left ventral arm in the form of a groove with 
convex bottom, bounded on either side by a narrow fillet ; on either 
margin of the groove is a row of minute suckers, which are larger 
and more distinct, and even form two series on the ventral aspect ; 
the tip of the arm bears two series of small suckers. The umbrella 
is better developed than usual, its greatest extent (between the 
lateral arms) being up to the eighth row of suckers. The buccal 
membrane has the usual seven points, but not very strongly marked ; 
the outer lip is smooth and thin, the inner papillate. 
The Tentacle is as long as the head and body together, with a 
slender and somewhat flattened stem ; the club is short and rather 
broad, and has a protective membrane on either side of the suckers, 
and a broad web on the dorsal aspect, extending for a distance equal 
