286 CHAEACINID^. 



are armed with a single series of small, flat, tricuspid teeth ; maxil- 

 lary teeth none ; a few minute teeth are implanted on the edge of 

 the palatine bone*. The anterior part of the hinder air-bladder is 

 celliilar. 



Peru, Ecuador. 



1. Lebiasina bimaculata. 



Cuv. 4- Val. I. c. pi. 587. 

 D. 10. A. 11. V. 8. L. lat. 25. L. transv. 8. Vert. 21/16. 



The height of the body is one-fourth, or rather more than one- 

 fourth, of the^ total length (without caudal), and more than the length 

 of the head. A round black spot on the root of the caudal fin ; a 

 blackish streak across the basal portion of the anterior dorsal rays. 



Peru, Ecuador. 

 a. Fine specimen. Bay of CaUao. Presented by Professor Nation. 

 h. Several specimens. Western Andes of Ecuador. From Mr. Eraser's 



Collection. 

 c. Skeleton. From Mr. Fraser's Collection. 



4. PYRRHULINA. 



Pyrrhulina, Cuv. Sf Val. xix. p. .535. 



Dorsal fin placed behind the middle of the length of the bodj- ; 

 adipose fin none ; anal rather short ; ventrals in front of the dorsal. 

 Body longish, covered with large scales ; head longish, with the cleft 

 of the mouth wide. Cheeks covered with the enlarged infraorbital 

 bones. The intermaxillary is armed with small teeth ; maxillary 

 toothless, received in a groove of the mandible ; mandibles with 

 several series of small teeth ; palate toothless. Air-bladder without 

 cellular portion. Gill-openings wide, the giU-membranes being 

 scarcely united below the throat. 



Surinam. 



1. Pyrrhulina filamentosa. 



Ctiv. 8,- Val. I. c. pi. 589. 



D. 9. A. 10. V. 8. L. lat. 26. L. transv. 7. 



Rays of the dorsal and caudal fins are produced into filaments. A 

 black band runs from the end of the operculum through the eye 

 round the snout, the margin of the mandible being black. Dorsal 

 fin with a very large black blotch. 



Guianas. 



a-b. Adult. Essequibo. Purchased of Mr. Ehrhardt. 

 * Valenciennes describes this bone as toothless. 



