ON SOME OIGOPSID CUTTLE FISHES, 
85 
their renal covering, and the hepatic ducts, with renal tissue 
in bunches at intervals. Two very distinct membranous 
funnels lead from the renal into the coelomic cavity. The 
coelom is not distinctly divided into two parts. The heart lies 
far back, and the ovary passes underneath the heart to its 
anterior attachment on the stomach. Posteriorly the ovary 
has another point of attachment, here to the coelomic wall. 
The genital artery is given off from the posterior aorta, and 
passes over the front of the heart. The coelom communicates 
freely with the space containing the branchial hearts. 
Most points in the anatomy of Histioteuthis lead, as I will 
point out afterwards, to a close association of this form with 
Thysanoteuthis. 
Traciieloteuthts Behnii (Steenstrup). 
The specimen examined (one of those captured at Messina, 
and presented by Professor Kleinenberg to Professor Lankester) 
agreed very closely with the description given by Pfeffer (10) 
of Verilliola nymph a, and therefore in all probability 
Hoyle is right in identifying the two genera. It certainly 
agrees with Steenstrup’s 1 (12) account of this species. The 
order of the arms in descending order of lengths was 2, 3, 4, 1. 
The second and third arm are very nearly equal, as may be 
seen from the actual measurement appended. The suckers of 
these arms, too, are much larger than those of the other arms. 
They are provided with slight membranous fins, as is also the 
fourth pair of arms (PI. X, fig. 1). 
The tentacular arms are relatively long, with a distinct club 
at the extremity. The suckers near the distal end are large 
and in four rows, but proximally pass over into the stalk in 
ight or ten rows of very minute suckers (PI. X, fig. 3). 
The club is provided with a lateral fin-like expansion, as in 
Doratopsis. 
The eyes are large, but not very prominent. 
On the back of the head are two pairs of large pigmented 
1 Steenstrup, ‘ Vid. Meddel nat. Foren Kjobenhavn,’ 1.883 . 
