PEECIDiE. 53 



b. Scales deciduous. 



a. The lateral line commencing beneath the second dorsal. An 

 acute ridge from the eye extending backwards over the 

 opercles 43. MiCKOiciiTiiys, 



ft. Tfte lateral line commencing behind the head. 



aa. Teeth on the palatine bones. 



aa. Praoperculmn with a double serrated ridge. The 

 first dorsal with six to seven, the anal with two 

 spines ; opercidum spiniferous 44. Ai-ogon. 



ftft. Praojjcrculum with a double entire ridge. The 

 fii'st dorsal with six, the anal vrith two spines ; 

 opercidum spuiiferous 45. Apogoniciitiiys 



bb. No teeth on the palatine bones. Eye very large. No 

 denticulations on the bones of the skull. Many 

 pancreatic caca 48. Pomatomus. 



2. The spinous dorsal little develojied. 



Scales minute, enveloped in the epidermis ; spines of the dorsal 



variable in number '62. Eii ypticus. 



3. One dorsal fin. 



ik . . 



^^' a. With two or three anal spines. 



^^H| a. Pyloric appendages in small number. 



^^^ aa. Operculimi with a strong hony ridge. 



Opercles denticulated ; scales small 29. Polypkion. 



bb. Operculum tvithout botig ridge, 

 §. No teeth on the palatine bones. 



OiJercles spiniferous ; the muciferous channels of the bones of 



the skull much developed ; scales rather small 9. Acerina. 



§. Teeth on the palatine bones. 



* Operculum spiniferous. 



** Scales moderate. 



i B. tuitk 12-13 spines. Body rather elevated 35. Myriodon. 



t 2). with 8 spines. Head entii-ely coverotl vidth 



scales 38. Glaucosoma. 



** Scales small. 



t Operculum very strongly armed; prfBopercidum 



with strongly serrated lower Unib ; dorsal with 



nine spines. Known only from stuffed specimens. 33. Aulacocepiialus. 

 t Opcradum moderately armed; pr;voperculmn not, 



or obtusely serrated. Dorsal with eleven spines. 50. Olicoru.s. 



* Bones of the skull without any dent icidut ions or spines. 



Dorsal with ten spines ; scales rather small 20. Apsilus. 



