SOUTH AMERICAN NEMATOGNATHI. 101 



uu. Head depressed, its width at the mouth about equal 

 to its greatest width. Adipose fin shorter than the 

 anal; caudal forked, the rays much branched. Maxil- 

 lary band of teeth much narrowed in the middle; 

 teeth on the vomer separated on the median line, closely 

 joined to the palatine patches, together forming, on 

 either side, a figure somewhat like a comma. Top of 

 head osseus; the occipital process produced, meeting or 

 nearly meeting the dorsal plate; fontanel extending 

 from the middle of the snout to behind the eyes and 

 continued to the occipital as a groove. 



PSEUDOPLATYSTOMA XXXV. 



mm. Upper jaw greatly produced. 



x. Snout broad, the width at the mouth being equal to the greatest 

 width of the head. Teeth of the upper jaw in a broad crescent- 

 shaped patch. Barbels fleshy. 

 y. Head abnormally depressed, the eyes strictly lateral. 



SORUBIM xxxvi. 



yy. Eyes superior. SORUBIMICHTHYS xxxvu. 



xx. Snottt long and pointed, the width at the mouth 1^ in the 

 greatest width of the head. Teeth of the upper jaw in a long 

 arrow-shaped patch; palatine patches longitudinally ovate, remote 

 from the vomerine patch. Maxillary barbels very much longer 

 than the body. PLATYSTOMATICHTHYS xxxvm. 



XI. PlMELODINA. 



Pimelodina Steindachner, SB. Ak. Wien, Ixxiv, 1876, 

 Ichthyol. Beitr. y, 101 (flavipinnis). 



Type: Pimelodina flavipinnis Steindachner. 



This genus is characterized by its prolonged, sub- 

 conical snout; by its dentition and by the nature of its 

 fins. 



68. Pimelodina flavipinnis. 



Pimelodina flavipinnis Steindachner, 1. c. 102, pi. 13, fig. 2 (Amazon 



near Para). 

 Habitat: Para. 



69, Fimelodina nasus. 



Pimelodina nasus Eigenm. & Eigenm. Proc. Cal. Acad. Sci. 2d Ser. 



vol. i, 1888, 120 (Para). 

 Habitat: Para. 



