42 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



in the position and structure of the luminous organs. On the other hand 

 Pterygoteuthis giardi differs from PL 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 I 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. 



Family HISTIOTEUTHIDAE. 



Histioteuthuiae Verrill, '81, p. 431. 

 Histioteuthidae Pfeffer, :00, p. 108. 



CALLITEUTHIS. 

 Calliteuthis Verrill, '80, p. 393. 



40. Calliteuthis reversa. 

 Calliteuthis reversa Verrill, '80, p. 303. 



Habitat. — Station 3385 ; off Cape Mala ; March 8, 1891 ; lat. 7° 32' 36" N., 

 long. li)° IG' W., 286 fathoms ; temperature, surface 72°, bottom 45. ©9, green 

 mud ; one specimen. No. 7962. [H. 48.] 



This specimen about 35 mm. long ai)pears 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 

 luniinou.s 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 jiroximally and two rows distally. Pfeffer 

 (: GO, pp. 1 69, 1 7t >) niake.s u.se 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 cartilaginou.") ridge fitting into the base of 

 the siphon, which was mentioned in the "Challenger" specimen, does not 

 appear in this young example. 



