ON SOME OIGOPSID CUTTLE EISHES. 
81 
Pfeffer 1 (10), however, says that they seem to have a double 
row of suckers, but here he is mistaken. 
The fourth arm, indeed, has a broad lateral expansion 
similar to that of Chiroteuthis, and this expansion bears small 
thickenings which correspond to the ridge-like projections on 
the lateral membrane of the club of Chiroteuthis. 
Verrill, in Leptoteuthis diaphana, which is really a 
Doratopsis, figures two rows of suckers and pigment spots, 
like those of Chiroteuthis, on this fourth pair of arms. 
The tentacular arms are long and terminate gradually in 
club-like expansions, bearing circular sessile suckers in four 
rows. These extend some way down the arm. The club is 
provided laterally with a protecting membrane (fig. 7). 
The mouth is surrounded by a thick papillate lip and a 
narrow buccal membrane (PI. IX, fig. 4). 
The eyes are large, but not pedunculate, and their opening 
has no lachrymal sinus. 
Somewhat below the eyes, on the ventral side of the body, 
project two small organs (fig. 3, olf. ory.), which seem to be 
supplied by nerves, and must, I think, be taken as homologous 
with the spoon-shaped organs of Chiroteuthis, and olfactory in 
function. 
On the dorsal side of the cerebral nervous mass two reddish 
spots are noticeable, the nature of which I was not able to 
ascertain. 
Behind the cephalic mass we find a very much elongated 
and almost perfectly transparent neck region. This portion 
of the body presents an appearance like that of segmentation, 
by a series (8 in this specimen) of plates with radiating margin 
lying along the median dorsal line. These organs, shown 
enlarged in fig. G, overlie directly the two strangs of visceral 
nerves, and seem supplied by branches from the aorta. I shall 
call them the stellate organs. 
The alimentary canal passes along the side of the aorta, 
the vena cava along the ventral side of the neck. 
1 Pfeffer, ‘ Abhandlungen des Naturwissenschaftliclien Vereins,’ Hamburg, 
1884. 
VOL. XXIX, PART 1. NEW SER. 
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