132 CALIFORNIA ACADEMY OF SCIENCES. 



37. Pimelodella cristatus ( Muller & Tioscbel ) . 



Pimelodus insignis Schombiivgk; descriptiou, uot plate; Pimelodus agasizii 

 Steindacbner; Pimelodus ophthalmicus Cope. 



Localities: San GoiK^allo; Avary; Villa, Bella; Jutahy; Topajos; Eio 

 Mucuri; Tabatinga; Hyavary; Coavy. 



38. Pimelodella wesselii (Steiudachnei). 



Localities: Cudajas; Para; Marajo; Eio Madeira; Eio Puty; San- 

 tarem . 



39. Pimelodella gracilis (Valenciennes) . 



Locality: Goyaz. 



40. Pimelodella pectinifer sp. nov. 



Type, No. 7508; length .19 m. Campos. Hartt & Copeland. 



Body robust, compressed posteriorly; head conical, its 

 greatest width IJ in its length, its depth at base of occipital 

 process equal to its width. Profile straight from dorsal to 

 eyes, thence decurved forward; head convex transversely. 

 Lateral margins of occipital process concave; distance from 

 the anterior to the posterior nostril IJ in eye. 



trals; mental barbels to base of pectoral, post-mental about to middle of 

 pectorals. 



Mouth wide, terminal, the lower jaw slightly the shorter; teeth of the up- 

 per jaw in a band of uniform depth, interrupted in the middle, its depth 

 about 6 in its width. 



Gill membranes separated by a deep notch; gill-rakers 2+6. 



Distance of dorsal fin from snout 2|-2i in the length; dorsal fin as long as 

 high, its free margin rounded; highest dorsal ray lf-2 in head; distance of the 

 adipose from the dorsal fin equals the length of the dorsal; adipose fin 2|-3j[- 

 in the length. 



Caudal divided to near its base, the lower lobe much the broader, 

 rounded; the upper lobe pointed; the lobes about equal in length, IJ in 

 head. 



Anal short and high, about as high as long, 2 in head. 



Ventrals inserted considerably behind the vertical from the last dorsal ray, 

 about half as long as the head. 



Pectoral spine strong, recurved teeth along its anterior margin, strongest 

 near the tip; much weaker teeth along its posterior margin to near its tip, 

 its length 2^-2^ in head; the longest ray 1| in head. 



Body brownish, covered with uumeroas dark dots; lower part of cheeks 

 and opercles similarly spotted; fins with small spots. 



Head 4-4^; depth oJ-6J; depth of caudal peduncle 10; Br. 7; D.I, 6; A. 

 11-12. 



