Jordan and Evcrmann. — Fishes of N'orth Avioi'ra. 1395 



m-m. Skull firm, not excessively cavernous, interorbital 

 space less broad ; preorbital not turgid ; soft dorsal 

 of less tban 30 rays. 

 o. Scales of the lateral line considerably enlarged, 

 almost entirely concealed by smaller ones; 

 anal tin small, inserted well forward its first 

 spine usaally as near ventrals as caudal; cau- 

 dal fin pointed, its peduncle long and slender; 

 soft dorsal and anal scaly ; scales small ; pre- 

 opercle without bony serrw; pseudobranchise 

 small, often obsolete on one side. (Fluviatilo 

 species.) Plagio.scion, 57;'). 



00. Scales of the lateral line similar to the others, luit 

 concealed by smaller ones ; anal fin inserted 

 more or less posteriorly, first spine usually 

 nearer caudal than ventrals ; caudal peduncle 

 rather short ; pseudobranchiae well developed . 

 p. Head not very broad, the interorbital space 

 not notably spongy nor deeply cavernous. 

 q. Preopercle with its membranaceous 

 edge entire, crenulate or ciliate, 

 with no bony teeth ; teeth in lower 

 jaw in few series. 

 )■. Teeth very small, equal, uniserial 

 or very nearly so; snout very 

 short; cleftof mouth obliqueor 

 oven vertical, the lower jaw 

 projecting. Larimus, 576. 



rr. Teeth larger, more or less un- 

 equal, those of the lower jaw 

 in one or two series or in 

 bauds ; cleft of mouth not ver- 

 tical, 

 s. Upper jaw with some of tlie 

 teeth enlarged, forming 

 canines ; some canines in 

 lower jaw; lower jaw- 

 projecting. 



Odontoscion, 577. 

 .Si-. Up]ier jaw witli a narrow 

 band of teeth, those of 

 the outer row more or 

 less enlarged; no distinct 

 canines. Corvula, 578. 

 qq. Preopercle with its bony margin arm- 

 ed with sharp teeth or serrsc. 

 t. Preopercle with its lowermost 

 spino directed abruptly down- 

 ward ; soft dorsal and anal fin 

 moderately scaly. 

 M. Lower jaw with a few slen- 

 der canines ; second anal 

 spine very small. 



Elattarchus, 579. 

 \ni. Lower jaw without canines; 

 second anal spine mod- 

 erate or large. 



Bairdiella, 5Sn. 



