42 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
in the position and structure of the luminous organs. On the other hand 
Pterygoteuthis giardi differs from Pt, margaritifera in the following characters ; 
1. The ventral arm has neither hooks nor suckers. 
2, The tentacular club has two fixing cushions and corresponding suckers 
and no hooks whatever. 
3. The subocular luminous organs are not so numerous, and the anterior ab- 
dominal organ is single and not a group of three. 
These differences, especially those relating to the armature of the tentacular 
club, seem to me of generic value, and Í see no alternative but the creation of 
a new genus with Enoploteuthis margaritifera as its type. For it I propose the 
name Pyroteuthis in allusion to its luminous organs, It is sufficiently diagnosed 
by the presence of intra-pallial luminous organs combined with a tentacular 
club armed with both hooks and suckers, 
Famy HISTIOTEUTHIDAE. 
Histioteuthidae Verrill, '81, p. 431. 
Histioteuthidae Pfeffer, :00, p. 168., 
CALLITEUTHIS. 
Calliteuthis Verrill, '80, p. 398. 
40. Calliteuthis reversa. 
Calliteuthis reversa Verrill, '8O, p. 393. 
Habitat. — Station 3385; off Cape Mala; March 8, 1891; lat. 7? 32' 36" N., 
long. 79° 16’ W., 286 fathoms; temperature, surface 72°, bottom 45.99, green 
mud ; one specimen, No. 7962, [H. 48.] 
This specimen about 35 mm. long appears to be the young of the above 
species. It is not in very good condition, and the surface has suffered abrasion. 
here and there. This makes it impossible to give the exact distribution of the 
luminous organs. There appear to be, however, on the first arm a single row 
on the outer margin, on the third arm a single row along the ventral margin, 
and on the fourth arm three rows proximally and two rows distally. Pfeffer 
(:00, pp. 169, 170) makes use of the distribution of these organs as a generic char- 
acter, and it therefore becomes of importance to ascertain whether it varies with 
age, and if so to what extent. 
The division into two parts of the cartilaginous ridge fitting into the base of 
the siphon, which was mentioned in the “ Challenger" specimen, does not 
appear in this young example. 
