TKIGLID.'E. 89 



Pi';corbital with an acute spine ; no cleft behind the 

 fourth gill ; pectoral appendage none ; dorsal with 

 12-17 spines, without any division 15. Tetrarooe. 



Head compressed ; praeorbital not armed ; pectoral 



appendage none ; dorsal without any division ... IG. Agriopus. 



Praeorbital with an acute 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 ; praeorbital vidth- 

 out a prominent sjjine ; pectoral appendage none ; 

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



Head smooth, compressed ; prreorbital not armed. The 

 three anterior dorsal spines forming a distinct 

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



Two separate dorsals, the spinous with a distinct ante- 

 rior division 20. He.mitripteru3. 



Praeoperculum and operculum smaU, not covering the 



gill-membrane 21. Ampiih'rioniciitiivs. 



Head monstrous. Vomerine teeth. One dorsal. Pec- 

 toral appendage none 22. Synancidii'm. 



Head monstrous. No vomerine teeth. One dorsal. 



Pectoral appendage none ; anal ratlier short 23. Syxaxceia. 



PraBorbital with a strong spine, directed downwards ; 



two dorsals, the first with eight spines 24. Micropus. 



One pectoral appendage 25. Minous. 



Two pectoral appendages 26. Pelor. 



Three pectoral appendages 27. Chohismodactylus. 



Third group ; Cottina. Triglidw 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 cnii'assed 

 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 pra'oper- 

 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 elongate, with three soft rays 30. Nautichtiivs. 



Head not depressed, body naked. Ventrals with five 

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

 toral appendages ; two dorsals 31. Scorp.exichthvs. 



Head bi'oad, depressed, body sealeless ; dorsal fins of 



moderate height ; no palatme teeth 32. Cottus. 



Head broad, depressed, body sealeless ; ventrals of 



moderate length ; palatine teelli 33. Centridermichthys. 



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



belly scattered scales ; palatine teeth 34. Icelus. 



