396 PEISTIPaMATIDiE. 



or Emmelichihys of Richardson ; but it is difficult to give the di- 

 stinctive characters of the species, as the descrijition quoted evidently 

 contains many errors : e. g. six branchiostegals are stated in the 

 diagnosis of the genus, and seven in the formula attributed to the 

 species ; two anal spines are given in the description, and thi'ee in 

 the figure, &c. The mouth also is said to be little protractile. 



4. Erythrichthys leucogrammicus. 



Dipterygonotus leucogrannnicus, Bleek. Contr. Ichth. Celebes. 

 Emmelichthys leucogrammicus, Bleek. Java, i. p. 103. 



B.7. D.lOMlf A. A 



Bluish, with three white longitudinal streaks on each side. 

 Sunda and Molucca Seas. 



a, h. Half-grown. Amboyna. Purchased of Mr. Frank, 

 c, d. Half-grown : not good state. Molucca Sea. Purchased of 

 Mr. Frank. 



25. PENTAPRION. 



Pentaprion, Bleek. Java, i. p. 104, and Verh. Batav. Genootsch. xxiii. 

 Mcenid. p. 13. 



Form of the body compressed, oblong ; eye moderate ; mouth very 

 protractile, and descending when thrust out. One dorsal, deeply 

 notched, with ten spines, the anal fin with five. Caudahs forked. 

 No teeth on the palate. Scales moderate, not cUiated, deciduous. 

 Six branchiostcffals. 



Sunda Sea. 

 Sleeker, I. c. 



Uniform silvery. 

 Sea of Batavia. 



1. Pentaprion gerreoides. 



D. 15. A. ^. 



14 12 



26. POLYCENTRUS. 



Polycentrus, Miill. (§• Trosch. in Schomb. Rcis. Brit, Guyana, ill. p. G22, 

 and Horm Ichthyol. ill. p. 25. 



Six branchiostegals. Praeoperculum and praeorbital serrated ; 

 operculum spinifcrous. No lateral line. Dorsal and anal fins with 

 numerous spines. ' Pharyngeal bones separated fron^, each other. 

 Pseudobranchiae hidden. 



Essequibo. 



1. Polycentrus schomburgkii. 

 Miill. 8f Trosch. I. c, and Hor. Ichthyol. iii. taf. 5. f. 2. 

 B. 6. D. ^. A. ^. V. 1/.5. 

 Brown. 

 Essequibo. 



