1. PLESiops. 3*33 



Second Group : Nandina. 



Pseudobranchiae none. Ventral rays five. Palatine and vomerine 

 teeth. (Nandoidei, Bleek.) 



Freshwater fishes of the East Indies. 



None of the bones of the head are serrated 3. Badis, p. 367. 



The praeoperculum only is serrated 4. Nandus, p. 367. 



Prsgoperculum and pr;corbital serrated 5. Catopra, p. 368. 



Third Group : Achamina. 



Pseudobranchiae hidden. Ventral rays five. No teeth on the palate. 

 Freshwater fishes from Tropical America. 



Bones of the head not armed 6. Acharnes, p. 369. 



First Group. PLESIOPINA. 



1. PLESIOPS. 



Plesiops, Out: Reym Anim. ; Midi. ^ Trosch. Hor. Ichtlujol. iii. p. 22. 

 Pharopteryx, Rilpp. Atl. Fische, p. 15. 



Body compressed, oblong, covered with scales of moderate size ; 

 lateral Line interrupted. Mouth moderately pi-otractile. Eleven or 

 twelve spines in the dorsal fin, three in the anal ; V. 1/4. The first 

 ventral ray is elongate, bifid. Small teeth in the jaws, on the vomer 

 and the palatine bones. None of the bones of the head serrated. 

 Six branchiostegals ; four gills, pseudobranchia; ; an air-bladder. 

 Pyloric appendages none. 



Carnivorous fishes from the Red Sea and the East Indian Archi- 

 pelago. 



1 . Plesiops nigricans. 



Pharopter}'x nigricans, iZwjjp. Atl. Fische, p. 15. taf. 4. fig. 2, and N. W. 

 Fische, p. 5. 



D.f. A.|. V.1/4. 



The height of the body equals the length of the head, and is two- 

 sevenths of the total. The maxillary extends behind the orbit. 

 Uniform greenish-black ; bluish dots on the opercles, fins, and on the 

 lower part of the sides. 



Red Sea. 



This and the two following species are, according to Dr. v. Bleeker, 

 perhaps only varieties of one, with which opinion I fully concur. 



2. Plesiops cseruleo-lineatus. 



Plesiops caeruleo-lineatus, Riipp. N. W. Fische, p. 5. taf. 2. fig. 5; 



Bleek. Amboina, iii. p. 116. 

 melas, Bleek. Verhand. Batav. Genootsch, xxii., Bali, p. 9. 



B. 6. D. '^. A. ^' V. 1/4. L. lat. 23. 



The height of the body is contained four or five times in the total 



