Families of Teleostean Fishes, 169 



Fourteen families : — 



I. Parietals separating the frontals from the supraoccipital ; post- 

 temporal simple; prcecaudal vertebrae with autogenous para- 

 pophyses. 

 Margin of the upper jaw formed by the prae- 

 maxillaries and the maxiilaries ; basis cranii 



simple ; no adipose dorsal tin 1. Galaxiidcs. 



Margin of the upper jaw formed by the proe- 

 maxillaries only ; basis cranii double ; 

 adipose dorsal fin present 2. Haphchitonidee. 



IT. Frontals in contact with the supraoccipital. 



A. Prajcaudal vevtebra3 without parapoplwses. 



1. Margin of the upper jaw formed by the praemaxillaries and the 



maxiilaries. 

 Body without or with minute scales, usually 



with rows of scutes ; adipose dorsal tin 



usually present 3. Encliodontidce f. 



Body scaly : post-temporal forked ; no adipose 



dorsal tin ; ventrals with 6 to 11 rays .... 4. Esocidce. 

 Body scaly; post-temporal incompletely ossified ; 



pectoral tin Avithout pterygials; no adipose 



dorsal tin ; ventrals with 3 rays only 5. Dalliidce. 



2. Maxiilaries excluded from the oral border. 



a. Adipose doi'sal fin usually present; ventral fin with 7 to 10 



rays. 



Post-temporal forked ; dorsal fin formed of arti- 

 culated rays 6. Scopelidce. 



Post-temporal simple ; dorsal tin very long, 

 formed of slender, non-articulated, simple or 

 bifid rays 7. Alepidosauridce. 



b. No adipose dorsal fin ; head and mouth enormous, dentition 



feeble ; bod}' naked ; ventral tins, if present, with 5 rays. 



8. Cetomimidce. 



B. Proscaudal vertebrae with well-developed parapophyses ; maxii- 



laries excluded from the oral border. 



1. Dorsal and anal tins without spines; scales cycloid, or with 



erect spines ; no adipose dorsal tin. 



Mouth not protractile ; ventral fins far forward, 



with 7 to 17 rays 9. ChirothricidcB f. 



Mouth not protractile ; ventral fins remote from 



the pectorals, with 9 ray.s 10. Kneriidce. 



Mouth protractile ; ventral fins, if present, with 



5 to 7 rays 11. Cyprinadontidce. 



Mouth scarcely protractile; ventral fins rudi- 

 mentary or absent ; vent close to the gills. . 12. Amblyopsidce. 



Mouth slightly protractile ; ventral tins with 5 



or G rays 13. Stephanoberi/cidce. 



2. Dorsal and anal fins with true spines ; scales ctenoid ; an adipose 



dorsal fin ; ventral tins with 9 rays. . 14. Percopsidce. 



