176 CHAEACINID.E. 



Anterior teeth larger; snout pointed ; a naked 



space between the suborbitals and the 



praeoperculuin ; scales small ; a scaly 



process at the base of the ventral ... 8. Paraphago, Blgr., p. 244. 

 Canine teeth in front ; a naked space between 



the suborbitals and the praeoperculum ; 



scales small ; a scaly process at the base 



of the ventral 9. Mcsoborus, Pellegr., p. 245. 



Anterior teeth a little larger ; snout narrow ; 



cheek entirely mailed ; scales large, hard ; 



no scaly process at the base of the 



ventral 10. Phago, Gthr., p. 246. 



B. A single series of teeth in each jaw, with or without cnrdiform teeth 



behind them ; canine teeth in front ; dorsal fin behind vertical of ventrals ; 



cheek naked ; scales small ; a scaly process at the base of the ventral. 



A single series of teeth 11. Neoborus, Blgr., p. 249. 



Gardiform teeth on the inner side of the jaws . 12. Iclithyoborus, Grthr., p. 251. 



C. Teeth very small, bicuspid, in a single series, which is widely interrupted 



in the middle in the upper jaw ; dorsal fin above ventrals. 



13. Hemisticliodus, Pellegr., p. 253. 



III. DistichodontiNjE. — Teeth small, notched or bicuspid ; upper jaw im- 

 movable or but slightly movable ; maxillary well developed ; scales 

 ciliated ; lateral line along the middle of the side. 



A. Gill-membranes free from isthmus. 

 Small teeth at the base of the maxillary ; 



lateral line complete or incomplete . . 14. Nunncethiops, Gthr., p. 254. 

 No teeth on the maxillary ; lateral line in- 

 complete or absent 15. Neolebias, Stdr., p. 256. 



B. Gill-membranes attached to isthmus. 

 No teeth on the maxillary ; suborbitals large, 



protecting the cheek ; dorsal with 16-27 



rays 16. THstichodus, M. & T., p. 258. 



No teeth on the maxillary ; suborbitals large ; 



dorsal with 12-15 rays 17. NannocJiarax, Gthr., p. 279. 



Small teeth at the base of the maxillary ; 



suborbitals narrow ; dorsal with 20-22 



rays 18. Xenocharax, Gthr., p. 287. 



IV. (JithariniNtE. — Minute ciliiform teeth inserted on the lips ; maxillary very 

 small ; gill-membranes free from isthmus ; lateral line along the middle of 

 the side. 



Scales strongly denticulated 19. Citharidium, Blgr., p. 289. 



Scales cycloid 20. Citharinue, Cuv., p. 290. 



