284 Isospondyli 
As in the Osteoglosside and in the Siluride, the subopercle is 
wanting in Pantodon, 
The Alepocephalide are deep-sea herring-like fishes very 
soft in texture and black in color, taken in the oceanic abysses. 
Some species may be found in almost all seas below the depth 
2 Bes By 
ae ys 3 
Fig. 217.—Alepocephalus agassizii Goode & Bean. Gulf Stream. 
of half a mile. Alepocephalus rostratus of the Mediterranean 
has been long known, but most of the other genera, Talis- 
mania, Muitchillina, Conocara, etc., are of very recent discovery, 
having been brought to the surface by the deep-sea dredging 
of the Challenger, the Albatross, the Blake, the Travailleur, 
the Talisman, the Investigator, the Hirondelle, and the Vio- 
lante. 
