12. GERRES. 339 



ctenoid. Six branchiostegals. Pseudobranchiae. (Th^ lower pha- 

 ryngeal bones separated.) Air-bladder simple. 

 East Indian rivers. 



1. Datnioides polota. 



Coius polota, Buck. Ham. pp. 95, 370. pi. 38. f. 31 ; Faun. Japan. Poiss 



p. 17 ; Richards. Ichth. Sulph. p. 83. 

 binotatus, Gi-ay, Ind. Zool. Pise. pi. 2. f. 2 ; Faun. Japon. Poiss. 



p. 17 ; Richards. Ichth. Sulph. p. 83. 

 Datnia polota, Cantor, Catal. p. 16. 



Lobotes hexazona, Bleek. Natuurk. Tyds, Ned. Ind, i. p. 9, ii. p. 1G5. 

 Datnioides polota, Bleek. I. c. v. p. 441. 



B.6. D.l?. A. 4 L.lat.70. 



Greenish, with eight blackish cross-bands. 



Estuaries of the Ganges ; rivers of Borneo and Sumatra. 

 a. Adult. Borneo. 

 h-h. Half-grown and young. India. 

 ?". Young. India, Presented by W. Masters, Esq. 



2. Datnioides microlepis. 

 Bleeker, Borneo, vii. p. 442. 



B. 6. D. j|. A. |. L. lat. 75-80. 



15 9 



Red, with eight black cross-bands. 

 Kiver Kapuas (Borneo). 



12. GERRES*. 



Gerres, Cuv. R^gne Anim. ; Cuv. ^ Val. vi. p. 446. 

 Catoch£enum, Cant. Catal. p. 55. 



Form of the body compressed, oblong or elevated. Mouth very 

 protractile, and descending when thrust out. Eye rather large. Prae- 

 operculum generally entire. Six branchiostegals. No canine teeth. 

 Dorsalis deeply notched, with the formula^; analisr^,. Caudal 

 forked. Scales moderate, minutely or not cihated. Air-bladder 

 simple ; pyloric appendages in small number. Pseudobranchiae. 



All the tropical seas, entering fresh waters. One species from the 

 coast of North America. 



* 1. Gterres bilobus, Cuv. ^ Val. vi. p. 466. — Cape Verde. 



2. peruvianus, Cuv. Sf Val. vi. p. i67 ; Less. Voy. Coq. Zool. Poiss. 



p. 180.— Coast of Peru. 



3. richii, Cuv. ^ Val. vi. p. 469.— East Indies? 



4. Smaris lineatus, Humboldt, Observ. Zool. p. 185. pi. 46. f. 1. — Q-erres li- 



neatus, Cuv. Sf Val. vi. p. 470. — Acapulco. 



5. Gterres limbatus, Cuv. Sf Val. vi. p. 476. — Catochsenum limbatum, Cant. 



Catal. p. 65. — East Indies. 



6. lucidus, Cuv. ^ Val. vi. p. 477. — Pondicherry. 



7. waigiensis, Quoy Sf Gaim. Voy. Freyc. Zool. p. 292. — Waigiou. 



8. Eucinostomus argenteus, Baird iSf Gir. Ninth Sitiithson. Report, p. 345, 



probably should be referred to this genus. The species being the 

 most northern, is highly interesting ; but the description given 

 does not distinguish it from East Indian species. — Coast of New 

 Jersey. 



2 



