350 CALIFORNIA ACADEMY OF SCIENCES. 



292. Cyclopium cyclopum. 



Pimelodiis cyclopum Hi;mboldt, Observ. Zool. i, 21, i^l. 6 (Cotojiaxi; 



Imbaburu; Cargueirazo; Tungaragna); Orton, The Ancles and 



the Amazon, 3d ed. 143, 1875 (San Pablo Lake at base of Cara- 



guairazo). 

 Aryes cyclopum Cuv. & Val. Hist. Nat. Poiss. xy, 340, 1840 (coioied). 

 Stygogenen cyclopum Gtinther, Cat. Fish. Brit. Mus. v, 224, 1864 



(copied). 

 Cyclopium cyclopum Putnam, Am. Naturalist, ,395, 1871 (Quito); 



Eigenm. & Eigeum. Proc. Cal. Acad. 2d Ser. i, 164, 18SS (Quito). 

 Cyclopium humbokltii Swainson,Nat. Hist. Fish, ii, 305, 1839 (copied). 

 Stygogenes humholdtii Giinther, 1. c. 223, 1864 (loc.?); Boulenger, 



Proc. Zool. Soc. Lond. 1887, 276, pi. xxi, fig. 2 (Canelos). 

 Habitat: Andes of Ecuador. 



Body elongate, slender, depressed in front, somewhat 

 compressed behind. Head short and broad, much de- 

 pressed, its lower surface flat, its upper surface somewhat 

 arched; width of head 1 in its length, depth 2. 



Eyes very small, placed just behind the middle of the 

 head, directed upward; interocular space 4 in the length 

 of the head; nostrils placed well forward. 



Maxillary barbels f length of head; lower lip broad, 

 with a deep median cleft. Teeth in bands in both jaws, 

 the teeth of the outer series in the intermaxillary simple, 

 slender, conical, curved; teeth of the inner series several 

 times as wide at their tips as at base, deeply notched; 

 teeth of the lower jaw similar to those of the inner series 

 of the upper jaw, the outer ones much larger. 



Gill-opening not extending forward to below the eye. 



Anterior region of the body with a median series of 

 conspicuous pores. 



Distance of the dorsal fin from the end of the snout 

 2i in the length; spine of the adipose fin very small. 



Anal rays closely crowded. Ventral fins inserted 

 slightly in advance of the dorsal, the outer ray as long 

 as the head. 



Pectoral as long as the ventral fins, reaching beyond 

 their base. The first ray of all the fins thickened and 

 covered with backward directed bristles. 



