304 cnAHACixiD^;. 



3. Anostomns gracilis. 



Schizodon gracilis, Kner, Denkschr. Acad. Wiss. Wien, 1859, xvii. 

 p. 160. taf. 5. fig. 11. 



D. 11. A. 10. V. 9. L. lat. 43-44. L. transv. 5/4. 



The length of the head is one-fourth of the total (without caudal). 

 Cleft of the mouth turned upwards. Each jaw with eight bicuspid 

 incisors. A round blackish spot on the lateral line, below the dorsal 

 fin ; another behind the gill-opening. (Kner.) 



Rio Guapore. 



4. Anostomus trimaculatus. 



Schizodon trimaculatus, Kner, Denksclir. Acad. Wiss. JFi'm,1859, xvii. 

 p. 161. taf. 6. fig. 12. 



D. 11. A. 10. V. 9. lat. 42-43. L. transv. 6/5. 



The length of the head is two-ninths of the total (without caudal). 

 Cleft of the mouth directed upwards. Each jaw with eight crenulated 

 incisors. A blackish blotch on the operculum ; a round black spot 

 on the lateral line, below the dorsal, and another small one at the 

 root of the caudal fin. (Kner.) 



Matogrosso. 



5. Anostomus fasciatus. 



Curimata fasciatus, Spix, Pise. Bras. tab. 36. 



Schizodon fasciatus, Agass. in &pix, Pise. Pros. p. 66 ; Mull. 8> Trosch. 



Hor. Ichth. iii. p. 10. tab. 1. figs. 5, 5a; Schomb. Fish. Guiana, i. 



p. 252. pi. 26. 

 Piabuca schizodon, Cuv. #• Vol. xxii. p. 112. 



D. 12. A. 11. V. 9. L. lat. 42-43. L. transv. 4/5. 



The length of the head is two-ninths of the total (without cau- 

 dal). The lower jaw scarcely projecting beyond the upper. There 

 are eight broad teeth in each jaw, each tooth with a convex serrated 

 margin. Body with five cross-bands : one across the middle of the 

 nape, the second below the dorsal, the third between dorsal and adi- 

 pose fin, the fourth below the adipose fin, the fifth, spot-like, at the 

 root of the caudal. In young specimens each of these cross-bands 

 terminates in a darker blotch on the side of the body. 



Brazil, Guianas, Nicaragua. 

 a, b-d. Adult and young. British Guiana. 

 e. Adult. Caraccas. 



6. Anostomus tseniatus. 



Schizodon tseniatus, Kner, Denkschr. Wien. Acad. 1859, xvii. p. 159. 

 taf. 5. fig. 10. 



D. 12. A. 10. Y. 10. L. lat. 44. L. transv. 5/5. 

 The length of the head is rather less than one-fifth of the total 

 (without caudal). The lower jaw projects beyond the upper. There 

 are eight incisors in each jaw ; they have the apex truncated, and only 

 the upper ones are serrated, the lower having entire margins. A dark 

 band runs from the upper part of the gill-opening to the middle of 



