8. (LEN0TR0PTJ8. 29/ 



12. Prochilodus taeniuras. 



Curimatus taeniurus, Valeric, in Humb. Observ. Zool. ii. p. 16G. 

 Prochilodus taeniurus, Cuv. fy Vol. xxii. p. 86. 



L. lat. 76. Caudal fin with a black medial streak, and with three 

 oblique black bands on each lobe. ( Vol.) 

 Brazil? 



8. OffiNOTROPUS. 



Chilodus, Mull. $ Trosch. Hor. Ichth. i. p. 10. 



Chilodus et Microdus *, Kner, Denkschr. Acad. Wien, 1859, .xvii. 

 pp. 149, 151. 



Dorsal fin placed nearly in the middle of the length of the body, 

 above the ventrals; anal short. Body oblong, covered with large 

 scales ; belly not compressed. Cleft of the mouth small ; teeth rudi- 

 mentary, moveable, in a single series, in one species in both lips, in 

 the other in the upper only ; palate toothless. Nostrils close toge- 

 ther, separated by a small lobe covering the posterior. Gill-openings 

 rather narrow, the gill-membranes being grown to the isthmus, with- 

 out free posterior edge. The suboperculum angular behind. The 

 fourth branchial arch dilated, convex behind and concave in front, 

 the convex side covered with a mucous membrane, which is trans- 

 versely folded. 



Guiana, Brazil. 



1. C»notropus labyrinthicns. 



Chilodus labyrinthicus, Kner, Denkschr. Acad. Wiss. Wien, I860, xvii. 

 p. 149. taf. 3. fig. 5. 



D. 12. A. 9. V. 10. L. lat. 28. L. transv. 4/4. 



Teeth in the upper lip only. The length of the head is one-fourth 

 of the total (without caudal). A broad silvery band along the middle 

 of the side ; a brownish spot above the pectoral ; each scale above 

 the silvery band with a small brown spot at the base. 



Amazons.' 



a. River Capin. Purchased of Mr. Stevens. 



2. Csenotropus punctatus. 



Chilodus punctatus, Mull. % Trosch. Hor. Ichth. i. p. 26. taf. 4. fig. 2 j 



Kner, Denkschr. Acad. Wiss. Wien, 1859, xvii. p. 151. 

 Citharinus chilodus, Cuv. fy Vol. xxii. p. 103. 



D. 11. A. ]2-13. V. 9-10. L. lat. 25. 



Teeth in the lower lip as well as in the upper. The length of the 

 head is a little more than one-fourth of the total (without caudal). 

 Each scale with a small brown spot at the base. A blackish band 

 along the side below the lateral line. Dorsal fin with small black 

 spots, and with a larger one anteriorly near to its top. 



Lake Amucu (Guiana). 



* Both these names are preoccupied. 



