74. EUANEMUS. 193 



Barbels four, very small : two at the mandible. Eyes behind the 

 angle of the mouth, of moderate size, covered by the skin of tbe head. 

 Ventrals with seven rays, inserted behind the dorsal. 

 Brazil. 



1. Tetranematichthys quadrifilis. 



Ageneiosus quadrifilis, Kner, Sitzgsber. Wien. Acad. 1858, xxvi. p. 442. 

 fig. 29. 



D. 1/6. A. 41. P. 1/10. V. 7. 



The length of the head is one-fourth of the total (with the caudal); 

 head granulated above. The upper jaw is scarcely longer than the 

 lower ; maxillary barbels very thin, shorter than those of the man- 

 dible, which are below the angle of the mouth and extend on to the 

 eye. Dorsal spine feeble, not serrated, longer than that of the pec- 

 toral fin, which is slightly serrated along both edges. The pectorals 

 extend to the root of the ventrals, the ventrals beyond the origin of 

 the anal. {Kner.) 



Rio Guapore. 



74. EUANEMUS. 



Euanemus, Mull. 8f Trosch. Hor. Ichth. iii. p. 11. 



Adipose fin very short ; dorsal short, with a pungent spine and 

 with six soft rays ; anal long. Barbels six, cylindrical : one to each 

 maxillary, the four others in a transverse series immediately behind 

 the symphysis of the mandible. Teeth villiform in the jaws, palate 

 edentulous. Eyes behind, and partly below the level of, the angle 

 of the mouth. The gill-opening does not extend downwards beyond 

 the root of the pectoral, the gill-membranes being united with the 

 isthmus. Bones of the head hidden below the skin. Ventrals with 

 fourteen rays, inserted behind the dorsal. 



Brazil and Surinam. 



1. Euanemus nuchalis. 



Hypophthalmus nuchalis, Spix, Pise. Bras. p. 17. tab. 17. 

 Auchenipterus nuchalis, Vuv. 8f Val. xv. p. 208; Kner, Sitzgsber. Wien, 



Acad. 1858, xxvi. p. 423. 



dentatus, Cuv. fy Val. xv. p. 210. 



Euanemus colymbetes, Mull. 8r Trosch. Hor. Ichth. iii. p. 11. taf. 1. 



fig. 2. 



B. 7. D. 1/6. A. 42-45. P. 1/11. V. 14. 



Head small, one-fifth, or rather less than one -fifth, of the total 

 length (without caudal), covered with soft skin ; groove between 

 the frontal bones very long, extending nearly to the occipital ; hu- 

 meral process short, hidden below the skin. Dorsal spine feeble, 

 slightly serrated behind. Caudal fin with a moderately deep incision. 

 The end of the upper caudal lobe black. 



Brazil and Surinam. 



i. Half-grown. River Capin, Para. Purchased of Mr. Stevens. 

 vol. v. o 



