606 TELEOSTEI CHAP. 
SYNOPSIS OF THE FAMILIES. 
I. Parietals separating the frontals from the supraoccipital ; post- 
temporal simple ; praecaudal vertebrae with autogenous parapophyses. 
Margin of the upper jaw formed by the praemaxillaries and the maxil- 
He ies ; basis cranii simple ; no adipose dorsal fin 
1. Galaxiidae. 
Margin of the upper jaw formed by the praemaxillaries only ; basis cranii 
double ; adipose dorsal fin present —. . 2. Haplochitonidae. 
II. Froutals in contact with the supraoccipital. 
A. Praecaudal vertebrae without parapophyses. 
1. Margin of the upper jaw formed by the praemaxillaries and 
ae maxillaries. 
Body without or with minute scales, usually with rows of scutes ; adipose 
dorsal fin usually present . ; : . 8, Enchodontidae.F 
Body scaly ; post-temporal forked ; no adipose dorsal fin; ventrals with 
6 to ll Tays . : | ete Esocidae. 
Body scaly ; post- feminaeal incompletely ossified ; pectoral fin without 
pterygials; no adipose dorsal fin; ventrals with 3 rays only 
5. Dalliidae. 
Maxillaries excluded from the oral border. 
a, Adipose dorsal fin usually present; ventral fin with 
7 to 10 rays. 
Post-temporal forked ; dorsal fin formed of articulated rays 
6. Scopelidae. 
Post-temporal simple; dorsal fin very long, formed of slender, non- 
articulated, simple or bifid rays . . 7. Alepidosauridae. 
b. No adipose dorsal fae head and mouth enormous, 
dentition feeble ; body eed ; ventral fins, if present, 
with 5 rays . : . 8. Cetomimidae. 
B. Praecaudal vertebrae with well-developed parapophyses ; maxil- 
laries excluded from the oral border. 
1. Dorsal and anal fins without spines; scales cycloid, or 
with erect spines ; no adipose fin. 
Mouth not protractile ; ventral fins far forward, with 7 to 17 rays. 
9. Chirothricidae.t 
Mouth not pete ventral fins remote from the pectorals, with 9 
rays : : . 5 . 10. Knervidae. 
Mouth probeachiles ventral fins, if present, with 5 to 7 rays 
11. Cyprinodontidae. 
Mouth scarcely protractile; ventral fins rudimentary or absent; vent 
close to the gills : : : . 12. Amblyopsidae. 
Mouth slightly protractile ; ventral fins with 5 or 6 rays 
13. Stephanoberycidae. 
2. Dorsal and anal fins with true spines; scales ctenoid; an 
adipose dorsal ; ventral fins with 9 rays 
14. Percopsidae. 
+ Fossil only. 
