TUIGLID^. 89 



Prieorbital with an acute spine ; no cleft behind the 

 fourth gill ; pectoral appendage none ; dorsal with 

 12-17 spines, without any division ^ 15. Tetraroge. 



Head compressed ; praeorbital not armed ; pectoral 



appendage none ; dorsal without any division ... 16. AoRioPus. 



Praeorbital with an acut« spine ; no cleft behind the 

 fourth gill; pectoral appendage none; the three 

 anterior dorsal spines forming a distinct division. 17. Prosopodasys. 



Head compressed, with obtuse ridges ; prseorbital with- 

 out a prominent spine ; pectoral appendage none ; 

 the dorsal fin anteriorly with a distinct division... 18. Aploactis. 



Head smooth, compressed ; praeorbital not armed. The 

 three anterior dorsal spines forming a distinct 

 division, the remainder of the fin being continuous. 19. Teichopleuea. 



Two separate dorsals, the spinous with a distinct ante- 

 rior division 20. Hemitripterus. 



Prseoperculum and operculum small, not covering the 



gill-membrane .j », 21. Amphiprioniciitiiys. 



Head monstrous. Vomerine teeth. One dorsal. Pec- 

 toral appendage none 22. Synancidium. 



Head monstrous. No vomerine teeth. One dorsal. 



Pectoral appendage none ; anal rather short ..;... ^3j- Synanceia 



Pi-seorbital with a strong spine, directed dcfwn'wards; 



two dorsals, the first with eight spines .....\ 24. Michopus. 



One pectoral appendage 25. Minous. 



Two pectoral appendages 26. Pelor. 



Three pectoral appendages 27. Chorismodactylus. 



Third group : Cottina. Triglida with the spinous portion of 

 the dorsal fin less developed than the soft and than the anal, with the 

 body naked, or covered with ordinary scales, or incompletely cuirassed 

 with single series of plate-like scales. Pyloric appendages in small 

 number. 



Head and body compressed, without any scales or ten- 

 tacles ; one small recurved spine at the prseoper- 

 cular margin ; ventrals rudimentary 28. Podabrus. 



Head and body compressed, the former with tentacles, 

 the skin of the latter with prickles ; ventrals rudi- 

 mentary 29. Blepsias. 



Ventrals eloneat«, with three soft rays 30. Nautichtuys. 



Head not depressed, body naked. Ventrals with five 

 soft rays, not enveloped in a thick skin ; no pec- 

 toral appendages ; two dorsals 51. ScorpjinichtMys. 



Head broad, depressed, body scaleless ; dorsal fins of 



moderate height ; no palatine teeth 32. Cottus. 



Head broad, depressed, body scaleless ; ventrals of 



moderate length ; palatine teeth 33. Centridekmichthys. 



A dorsal series of bony plates ; on the sides and on the • 



belly scattered scales ; palatine teeth 34. Icelus. 



