64 PEECII).¥. 



0. Pyloric appcndai/cs in increased tiu)/ibcr. 



* Prceoperczdum with spinous teeth at the lower limb. Natiu-al 



characters of Plcctropoma 28. Tracu ypom a. 



* Praopercidum finely serrated. Dorsal with nine slender 



spines; operculum spiniferous ; scales moderate 52. Arripis. 



b. With, four or Jive mud spines. 

 Scales sometimes osseous. Body high, triangidar; anal fin 

 with five spines ; prjeoperculum denticulated ; opercukma 

 rounded 39. Pestaceros. 



c. Anal spines none. 

 No true scales ; osseous protuberances 40. Oreoso.ma. 



B, Canine teeth at the outer side of the villiform bands. 

 1. Two dorsals. 

 * Anal with ttco spines, 

 ft. Sccdes small, adherent. Twelve to fourteen dorsal spines ; 

 operculmn spiniferous ; prreoperculum with a simple ser- 

 rated edge 11. LrtiOPERCA. 



b. Scales large, deciduous. Six dorsal spines ; praeoperculum 



with a double serrated edge 46. CiiiLODiPTERUi*. 



* Anal with three spines. 



n. OperciduM produced into a long, denticidated point 49. Acropo.ma. 



h. Operculum with two points, not denticulated ; scales moderate, 



adherent. Nine dorsal spines 15. Etelis. 



c. Opercidum with ttvo feeble points; scalesmoderatc, deciduous. 



Eight dorsal spines ; no denticulations on the bones of 



the skull 47. Sco.mbrops. 



2. One dorscd. 



a. Canines very small. Vomerine teeth in an angidar band or 

 a short triangular patch. Dorsal generally with the for- 

 mula — anal with — ; operculum spiniferous ; prseoper- 

 cidum serrated, without notch ; scales moderate or rather 

 small 21. Centropristis. 



/). Canines distinct. 



a. Scales inoderatc. 



aa. Prceopercuhim serrated. 



aa. Snout short, hltmt, with a rather narrow pne- 

 orbital ; dorsal generally with ten, anal with 

 tlu-ee spines ; eaudalis forked, and mostly one 

 or several of the fins elongate; operculimi 

 spiniferous 23. Aivthias. 



/3/1 Snout rather elongate and high, with flat sides, 

 and with a large broad prtsorbital. 



* Praopercidwm without or with a, vcri/ 



open notch behind 37. Mesoprion. 



* Praoperculum with a deep notch, re- 



ceivifig a knob of interopcTculuui 36. Genyoroge. 



hh. FrcBopcrcidum entire. Dorsal with ten, anal with 



tlu-ee spines ; opercidum spiniferous 19. Apbion. 



