YERTEBRATA. 



181 



scales are minute and embedded in the skin. Gymnotushns two 

 sets of electrical organs. 



Mu/reenidee. 

 Saccopharynx. 

 Anguilla (Eel). 

 Conger. 

 Ophisurus. 

 Myrus. 



ABDOMIXALIA. Fin-rays soft ; the first dorsal and first pectoral 

 rays frequently spinous. Ventral fins behind the pectoral. Swim- 

 bladder furnished with an air-tube. 



Fresh- and salt-water fish ; a few only, chiefly Cyprinidte, are 

 vegetable feeders. The skin is either naked or covered with 

 cycloid scales ; some of the Siluridae are encased in bony plates ; 

 Salmonidae have the second dorsal fin without rays. Amblyo- 

 psidae are remarkable for having the anus under the throat, hence 

 they have received the name of Heteropygii. In Anableps the iris 

 is perforated by two pupils. Malapterurus is electrical. The 

 male Arius carries the eggs in its mouth until they are hatched. 

 One species, the flying-fish, is capable of sustaining itself out of 

 the water for about 300 yards, turning round and rising and 

 falling with the swell of the sea. 



Glaus has nine families in this group. It forms the order 

 Malacoptera of Schmarda. 



Elops. 

 Pristigaster. 



Osteochilus. 



Gonorhynckidce. Cyprinus (Carp). 

 Gonorhynchus. Catastomus. 



