ELASSOMATIDiE. — LXI. 113 



jaws, vomer, and palatines; premaxillary not protractile; maxil- 

 lary simple; preopercle and preorbital serrate; opercle with a 

 spine ; bones of skull somewhat cavernous ; gill rakers tubercle- 

 like ; gUl membranes slightly joined to isthmus ; no pseudobranehiae ; 

 gills complete. B. 6. Scales strongly ctenoid ; no lateral line. 

 Vent anterior, below the preopercle in adult, farther back in young, 

 its position changing by a lengthening of the rectum. Dorsal small, 

 with 3 or 4 spines ; anal with 2 ; ventrals without spine and with 

 seven soft rays (all other perch-like fishes having one spine and five 

 rays) ; C. rounded. Vertebrte 29. Air bladder large. Pyloric 

 cffica 12. One species, a small fish of nocturnal habits, abounding 

 in sluggish grassy lowland streams throughout the Eastern U. S. 



147. APHREDODERUS Le Sueur. (&(jioSos, excrement ; 

 Seprj, the throat.) 



295. A. sayanus (Gilliams). Pirate Perch. Dark olive, 

 profusely dotted with black ; two dusky bars at base of C. Head 

 3 ; depth 3. D. Ill, 11. A. II, 6. Lat. 1. 48 to 58. L. 6. N. Y. 

 to La., and N. to Minn, and Lake Erie ; variable. (To Thomas 

 Say, the entomologist.) 



Family LXL ELASSOMATID.^. (The Tint Perches.) 



Body oblong, compressed, with large cycloid scales ; mouth small ; 

 teeth conic, strong, on jaws, a few on vomer ; upper jaw very pro- 

 tractile ; opercles entire ; gill membranes broadly united, free from 

 the isthmus ; gill rakers tubercle-like ; lower pharyngeals narrower, 

 with sharp teeth. B. 5. No lateral line ; pseudobranchise rudi- 

 mentary. V. normal (I, 5). Dorsal small, with 4 spines ; anal 

 with 3 ; C. rounded. Vertebrae 24. One genus, with two species, 

 E. evergladei Jordan, of Florida, and the following. They in- 

 habit sluggish, lowland waters of the E. U. S., and they are among 

 the smallest of all fishes. 



148. ELASSOMA Jordan. (iKaaawjia, a diminution.) 



296. B. zouatum Jordan. Olive green, finely speckled ; sides 

 with 1 1 dark bars ; a round black spot on side behind shoulder ; 

 fins spotted ; a bar at base of C. Eye large ; mouth small. Head 

 3 ; depth 3^. D. V, 9. A. HI, 5. Scales 40-19. L. 1 to 1^. 

 S. 111. to Ark. and La., in grassy brooks. (Lat., banded.) 



Family LXIL CBNTEARCHID^. (The Sun-fishes.) 



Body more or less shortened and compressed, so that the regions 

 above and below the axis of the body are nearly equal and corre- 

 spond to each other. Mouth terminal ; teeth small ; premaxillary 

 protractile ; maxiUary with a supplemental bone which is sometimes 



