igog.] R. E. Lloyd: Deep-Sea Fish caught by the ''Investigator." 147 



than the dorsal, commences anteriorly to it. The tenth ventral spine is opposite the 

 first dorsal. 



The diameter of the eye, which is equal to the length of the snout, is 3|- in the total 

 length of the head. The posterior end of the maxilla just reaches a vertical through 

 the anterior border of the eye. The gill-covers are large and widely open ; they 

 contain six branchiostegals and are covered with soft brownish black skin, like t-he 

 cranium and snout. The gill-rakers are numerous, long, lanceolate and acute. 

 Pseudobranch small. The teeth are well-developed in the premaxillse and dentaries, 

 a few small teeth on palatines and three or four minute teeth on vomer. 



In the mid-line of the back in continuation with the dorsal fin nearly up to the 

 head is an empty fold of skin bearing scales as in Aulastomatomorpha. Scales through- 

 out are very small and nearly circular. Stomach siphonal Eight pyloric caeca. 



The chief peculiarities are the small and numerous scales and the extension of 

 the ventral fin well beyond the level of the dorsal. Both of these features are asso- 

 ciated in the genera Conocara and Aulastomatomorpha. On the whole the species 

 resembles A. niger (Giinth.) more than any other species. Colour black. 



Five specimens, the longest 20 cm. in length. Stations 273 , 336 and 297. Arabian 

 Sea, 850, 700 and 600 fathoms. Registered Nos. --t-^> ^"ï^-, ^-i^-. 



Alepocephalus loiigiceps, sp. nov. 



lllustv. Zool. ''Investigator" Fishes, plate xliv, fig. 2 (1909). 



B. 6, D. 20, A. 23, P. 10, V. 6, Iv.l. 52, L.tr. 5-1-6. 



The length of the head is considerably more than a third of the total without the 

 caudal. The greatest height of the body — which is at the level of the pectoral fins — is 

 6J in the total without the caudal. The vent is nearer the gill opening than the end 

 of the tail The attachment of the ventrals is somewhat nearer to the vent than to 

 the gill-opening. The dorsal and anal fins are opposite to one another. The diame- 

 ter of the eye is a fifth of the length of the head. The snout is long and pointed ; its 

 length is equal to the postocular length of the head. The upper jaw projects consi- 

 derably beyond the lower as much as a distance equal to half the diameter of the eye. 

 It is nearly horizontal when closed. The mouth is capable of wide extension. When 

 closed the whole of the maxilla is in front of a vertical through the anterior border of 

 the eye. The ends of the maxilla are very conspicuous and hang down slightly below 

 the level of the lower jaw. 



The gill-covers are voluminous and widely open below ; one partially overlaps 

 the other. They contain six branchiostegal rays, nnd are covered with soft black skin. 

 The skin on the top of the head and snout is thin. The gill-rakers are numerous, long, 

 lanceolate and acute. The gill-filaments are short and delicate. Pseudobranchs 

 present but small. 



The teeth on the premaxillary and dentary are very minute ; on palatines and 

 vomer present but minute. Stomach siphonal. Seven rudimentary caeca. 



