PEUCID^. 67 



II. Group with the type of Serranus. — Mostly inhabitants of the 

 sea. Form of the body oblong, rarely elevated. Opercles denticulated 

 or armed. Scales conspicuously ctenoid, small, or of moderate size. 

 Cleft of mouth slightly oblique. Mostly with one dorsal ; the number 

 of spines constant, or little variable in the species of one genus. 

 Son?etimcs more than ten pyloric appendages. Serranina. 



19. Aprion. 26. Serranus. 33. Aulacocephalus. 



20. Apsilus. 27. Plectropoma. 34. Diploprion. 



21. Centropristis. 28. Trachypoma. 35. Myhiudon. 



22. Callanthias. 29. Poltprion. .36. Genyoroge. 



23. Anthias. 30. Pogonoperca. 37. Mesoprion. 



24. Anyperodon. 31. Grammistes. 38. Glaucosoma. 



25. Prionodes. 32. Rhypticus. 



III. Group with the type of Pentaceros. — Osseous scales or pro- 

 tuberances, or the integuments of the head bony. Pentaceratina. 



39. Pentaceros. 40. Oreosoma. 



IV. Group with the type of Priacanthns. — Cleft of the mouth ap- 

 proaching the vertical line, chin prominent ; scales small, strongly 

 ctenoid, rough ; the number of spines constant ; few pyloric append- 

 ages. Priacanthina 

 41. Priacanthts. 



V. Group with the type of Apogon. — Inhabitants of the sea and of 

 fresh waters, with deciduous scales generally of large size. Form of 

 the body more or less elevated. Opercles mostly denticulated or 

 armed ; cleft^ of the mouth oblique, or approaching the vertical hne. 

 Two dorsals. Apogonina. 



42. Ambassis. 46. Chtlodipterus. 



43. Microichthys. 47. Scombrops. 



44. Apogon. 48. Pomatomus. 

 46. Apooonichthys. 49. Acbopoma. 



VI. Group with the type of Grystes. — Inhabitants of the sea and 

 chiefly of fresh waters. Form of the body oblong or elevated. Oper- 

 cles indistinctly denticulated or armed, or entirely smooth. Scales mi- 

 nutely ciliated, or cycloid. Cleft of the mouth more or less oblique. 

 Mostly with one dorsal ; spines sometimes in variable number in one 

 genus. Sometimes many pyloric appendages. Fishes deviating most 

 from the original type of the Percoids ; and Dules approaching to the 

 Theraponidce. Grystina. 



50. Oligorus. 54. Percilia. 58. Anoplus. 



51. Grystes. 66. Centrarchus. 59. Odontonectes. 



52. Arripis. 66. Bryttus. 00. Dules. 

 63. HuRO. 57. PoMOTis. 



