294 CALIFORNIA ACADEMY OF SCIENCES. 



Color purplish, back darker than below; head, nape, 

 and humeral region with round dark dots; a dark spot 

 in center of each caudal lobe, inner surface of pectorals 

 dotted. 



Head 5|; depth above first anal ray 5; D. 1,3; A. 61. 



No. 9834, four specimens .086-.13m. 



Types of E. longipinnis Steind. Hyavary. Bourget. 



LII. AUCHENIPTERUS. 



Auchenipterus Guv. & VaL, Hist. Nat. Poiss. xv, 207, 

 1840 (nuchalis). 



Evanemus Muller & Troschel, Hor. Ichthyol. iii, 11,, 

 1849 (colymbetes= nuchalis). 



Type: Hypophthalmus nuchalis Spix. 



As Cuvier & Valenciennes clearly indicate nuchalis* 

 to be the type of Auchenipterus, the later name Evane- 

 mus should not be substituted. 



Barbels six, two on the maxillaries, four on the chin, 

 inserted close behind the lip and in a line parallel with 

 its margin. Adipose fin short. Dorsal fin with a spine 

 and 6 rays. Anal fin long. Ventral fins posterior to 

 the dorsal fin, each with 12-15 rays, broadly joined to 

 the belly or connected together. Bones of the head 

 rather thick, covered with skin. Occipital process para- 

 bolic behind, meeting the dorsal plate. Postcoracoid 

 process ending in a sharp point. Teeth villiform; palate 

 edentulous. Gill-membranes confluent with the skin of 

 the isthmus. Humeral process present, usually concealed 

 under the skin. Lateral line zig-zag, with numerous 

 branches. 



Habitat: Amazon; Surinam. 



* La position tres-avancee de sa premiere dorsale, qui lui avait vain de 

 la part de M. Spix 1'epithete de nuchalis, nous a suggere son nom gene- 

 rique Auchenipterus. C. & V. xv, 207. 



