PUISTiro.MATID.H. 273 



B. Air-bladder not contracted. 



1. TeetJi in the jaws, 

 a. Mouth moderately protractik. 



* Praopcrndum serrated. 



Seven branchiostegals. A central groove behind the sym- 

 physis of tlie lower jaw. The vortical fins not scaly, or 

 at the base only. Teeth of the jaws ^nllifonn 4. Pristipo.m a 



Seven (?) branchiostegals. A central groove behind the sym- 

 physLii of the lower jaw. In each jaw an external series 

 of very stout and conical teeth 5. Conodon. 



Seven branchiostegals. A central groove behind the symphysis 

 of the lower jaw. The soft portions of the vertical fins 

 scaly to their margin 6. H/emulon.| 



Seven brancliiostegals. Chin covered with barbel-like pajjilla?. 7. HAPALoaENva. 



Six or seven branchiostegals. Lower jaw with pores, but 

 without central groove. The upper profile of the head 

 parabolic 8. Diagramma. 



Seven brancliiostegals. The spinous dorsal very low, scarcely 



continuous with the soft, with eight spines 0. Hyperoglypiie. 



Six branchiostt'gals. Body elevated ; the upper profile of the 



head concave 10. Lobotes. 



Five branchiostegals. Prworbital with a spine directed back- 

 wards 13. ScoLOPSis. 



Five or six branchiostegals. Prajorbital not armed. Caudalis 



deeply forked 14. Heterognathodon. 



Seven branchiostegals. Lower jaw without pores. Dorsal fin 



with ten spines 17. Pristipo.moides. 



• Praoperadiim entire. 



Canine teeth ; distance between the eye and the angle of the 

 mouth great ; more than tlu-ee series of scales between 

 the eye and the angle of the prsvopcrculum. Dorsal 

 scaleless 15. Dentkx. 



Canine teeth ; distance between the eye and the angle of the 

 mouth great. Three series of scales between the eye and 

 the angle of the priBoperculum. Dorsal scaleless 16. Synagris. 



Canine teeth ; distance between the eye and the angle of the 

 mouth small. More than tlu-ee series of scales between 

 the eye and the angle of the prasoperculum. Dorsal 

 scaleless 18. Pe.ntapu.s. 



Four branchiostegals. Canine teeth none 19. Ch-etopterus. 



Seven branchiostegals. Canine teeth none 20. Aph areus. 



Dorsal scaly along the base 23. CvESIO. 



h. Mouth very protractile. 



Spines of the fins very stout ; twelve in the dorsal fin 11. Datnioides. 



Dorsal^; anal—— 12. Gerrbs. 



Spines of the fins feeble. Dorsal scaleless. Vomerine teeth... 21. Mi£NA. 

 Spines of the fins very feeble. Dorsal scaleless. Vomerine 



teeth none 22. SsiARrs. 



T 



