624 



TELEOSTEI 



In Halosaurus tlie scales of the lateral line, which runs near 

 the lower profile, are scarcely enlarged, and are destitute of 

 luminous organs. HalosauricMliys differs in the union of the 

 ventral fins with each otlier, as in Notacanthus. In Halosauropsis 

 the scales of the lateral line are strongly enlarged and pouch- 

 like, and bear photophores. 



This family is one of great antiquity, being represented in 

 the Upper Cretaceous of Westphalia by UchidiwcejAalus, which, 

 as shown by A. S. Woodward, appears to have been closely 

 related to Halosaurus. 



Fig. 379. — flalosanropsis macrochir, ^ nat. size. (After Gilnther.) 



Fam. 3. Lipogenyidae. — Similar to the preceding in shape 

 and in the position of the dorsal fin, but with a toothless, 

 roundish, inferior, suctorial mouth, and with the short dorsal and 

 the long anal formed partly of spines and partly of soft rays. 

 Head and body covered with minute scales ; lateral line nearer 

 the dorsal than the ventral profile. A'^entrals with 3 spines and 

 7 soft rays. A single species, Lipogenys gillii, from the North 

 Atlantic, 865 fathoms. 



Fig. 380. — Lipogenys gillii. (After Goode and Bean.) 



Fam. 4. Notacanthidae. — Body elongate, covered with very 

 small cycloid scales, the tail tapering to a point, without caudal 

 fin ; head scaly ; mouth small, inferior, bordered by the prae- 

 maxillaries only ; jaws toothed ; no suborbitals ; praeoperculum 

 small; post -temporal replaced by ligament. Dorsal fin formed 

 of a series of short disconnected spines ; anal very long, formed 

 partly of spines and partly of soft rays, extending to the end 

 of the tail. Ventrals with 1 to 5 spines and 7 to 10 soft 

 rays. 



