THE SHORE FISHES OF PERU 17 



i' . Lateral line extending to end of caudal fin. 

 j' . Anal with 3 strong spines and about 6 or 7 

 soft rays; dorsal in 2 parts; svipraclavicle 



serrate Centropomidae (p. 228) 



ji' . Anal with 1 or 2 spines; dorsal fin deeply 

 notched or in 2 parts; supraclavicle not 



serrate Sciaenidae (p. 258) 



ii' . Lateral line not extending on caudal fin (in 



Peruvian species). 



k' . Anal fin composed entirely of soft rays 



(about 15 in Peruvian species) ; dorsal fin 



in 2 parts, the first with spines only (in 



Peruvian species) Cottidae (p. 458) 



A-fc'. Anal with 2 or 3 well-developed spines (in 

 Peruvian species). 

 I' . Anal with 2 spines and about 8 or 9 soft 

 rays; dorsal fin in 2 parts, the first with 

 about 6 spines (in Peruvian species), 

 scales large, about 23 to 27 in lateral 

 series (in Peruvian species). 



Apogonidae (p. 193) 

 W . Anal with 3 spines; dorsal continuous, or 

 deeply notched, rarely in 2 parts, 

 generally with more than 6 spines. 

 vi' . Gill membranes united with the 

 isthmus; body short, deep, com- 

 pressed, depth notably exceeding 

 half length; teeth brushlike. 

 n' . Dorsal fin deeply notched or in 2 

 parts; scales rather small, about 

 50 to 100 in lateral series. 



Ephippidae (p. 318) 



nn' . Dorsal fin continuous, not deeply 



notched; scales larger, about 30 to 



40 in lateral series (in Peruvian 



species) . 



Chaetodontidae (p. 320) 

 mm' . Gill membranes free from the isthmus; 

 body more elongate, depth gen- 

 erally not exceeding half length; 

 teeth not brushlike. 

 o' . Premaxillaries excessively protractile, 

 premaxillary spine extending to 

 interorbital just underneath skin; 

 scales large, about 35 to 45 in a 

 lateral series (in Peruvian species). 

 Qerridae (p. 237) 

 oo' , Premaxillaries not excessively pro- 

 tractile; scales generally smaller, 

 usually more than 45 in a lateral 

 series. 

 p'. Teeth in jaws fused, forming a 

 continuous plate or beak. 



Oplegnathidae (p. 322) 



