Jordan and Ever ma nn. Fishes of North America. 453 



base under anterior portion of dorsal, the length of its base about 

 that of dorsal. The caudal fin has its median rays as long as the diameter 

 of the eye, and the external rays at least % the total length of the fish. 

 The pectoral commences at a distance from the snout equal to i of the 

 length of the body. The ventrals are inserted considerably behind the 

 middle of tho length (0.57), and appear to have been at least as long as the 

 diameter of the orbit. The type was obtained by tho Albatross from 

 station 2035, at a depth of 1,362 fathoms. (Goode & Bean.) (productus, 

 drawn out.) 



Alepocephalus producing, GILL, Proc. IT. S. Nat. Mus., 1883, 256, Gulf Stream at Albatross Sta- 

 tion 2035, in 1,362 fathoms; (Type, No. 33341. Coll. Albatros*); GOODE & BEAN, Oceanic 

 Ichthyology, 37, fig. 46, 1895. 



745. ALEPOCEPHALUS AGASSIZII, Goode & Bean. 



Head 3 ; depth 5 ; eye 3|. D. 15 ; A. 17 ; scales 10-90-11. Body a little 

 deeper than in MitcMllina bairdii. Head compressed, the snout conically 

 elongate, the lower jaw slightly produced ; width of head 9 in length of 

 body (12 in M. bairdii). Scales parchment-like. Dorsal inserted directly 

 above verit, the distance from its origin to base of caudal its distance 

 from front of eye ; anal inserted under second ray of dorsal. Length of 

 pectoral equal to diameter of eye, 10| in body. Ventral about 

 of head. Dusky j head and fins nearly black. Gulf Stream, latitude 30, 

 in 922 fathoms. (Goode & Bean.) (Named for Professor Alexander 

 Agassiz, in whose deep-sea researches the species was obtained.) 



Alepocephalus agassizii, GOODE & BEAN, Bull. Mus. Comp. Zool., 1882, 215, Gulf Stream ; GOODE 

 & BEAN, Oceanic Ichthyology, 37, 1895. , 



746. ALEPOCEPHALUS TENEBROSUS, Gilbert. 



Head 3 ; depth 4f to 5 ; eye 4J. D. 17 j A. 17 ; P. 10 ; scales 16-90-16, 

 55 tubes in lateral line. Allied to A. agassizii. Body compressed, 

 elongate j maxillary reaching front of pupil, its length from snout 2 in 

 head ; teeth in single series. Snout short, compressed, 3| in head. Dor- 

 sal ending slightly before anal j pectoral 2| in head, much longer than 

 eye. Scales of lateral line much enlarged, forming a raised ridge. Uni- 

 form blue-black. Santa Barbara Channel, California, at 359 to 822 

 fathoms. (Gilbert.) (tenebrosus, dusky.) 



Alepocephalus tenelrom*, GILBERT, Proc. U. S. Nat. Mus., 1891, 546, Santa Barbara Channel. 

 (Coll. Gilbert.) 



225. MITCHILLINA, Jordan & Evermann. 



MUchillina, JORDAN & EVERMANN, new genus, (bairdii). 



In discussing the species of Alepocepkalus, Goode and Bean make the 

 following observations : 



There are two distinct groups in Alepocephalus, probably of subgeneric 

 value. The first group includes the type, A. rostratus, Risso. It is 

 characterized by a somewhat short, compressed body, large head, with 

 extended membranaceous flaps, and by short dorsal and anal fins, similar 

 in size and shape and nearly opposite each other. 



A. bairdii represents another type, having a stout body, about as high 



