396 PBISTIPOMATID^. 



or Ihmnelichthys of Ricliardson ; but it is difficult to give the di- 

 stinctive characters of the species, as the description quoted evidently- 

 con tains 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 three ia 

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



4. Erythrichthys leucogrammicus. 



Dipterygonotus leucogi'ammicus, Sleek. Contr. Ichth. Celebes. 

 Emmelichthys leucogTammicus, Sleek. Java, i. p. 103. 



B.7. D.10|4|f A.i,. 



Bluish, with three white longitudinal streaks on each side. 

 Sunda and Molucca Seas. 



rt, 6. 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. 

 31epnid. 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 ciliated, deciduous. 

 Six branchiostegals. 



Sunda Sea. 

 Sleeker, I. c. 



Uniform silveiy. 

 Sea of Batavia. 



1. Pentaprion gerreoides. 

 26. POLYCENTRUS. 



Polycentriis, 3Ilill. ^- Trosch. in Schomb. Reis. Srit. Guyana, iii. p. G22, 

 and Horce Ichthyol. iii. p. 25. 



Six branchiostegals. Praeoperculum and prjeorbital serrated ; 

 operculum spiniforous. No latei'al Hne. Dorsal and anal fins with 

 numerous spines. Pharyngeal bones separated from each other. 

 Pseudobranchiis hidden. 



Essequibo. 



1. Polycentrus schomburgkii. 



Mull. ^ Trosch. I. c, and Hor. Ichthyol. iii. taf. 5. f. 2. 

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

 Brown. 

 Essequibo. 



