Jordan and Evervtann. — Fishes of North America. 2265 



body, connected by membrane to dorsal and anal ; sides with regular cross 

 series of pores. Body with narrow angular cross bars; dorsal rays violet, 

 the membrane yellowish. (Steindachner.) Shores of Ecuador and Peru, 

 ascending rivers. 



Amblyopus peruanus, Steindachner, Fiscb-Fauna des Caiica undFliisse bei Guayaquil, 



42, 1880, Guayaquil. 

 Gobioides peruanus, Eigen.mann & Eigenjiann, Proc. Cal. Ac. Sci., 2d ser., i, 1888,75. 



832. CAYENNIA, Sauvage. 

 Cayennia, Sauvage, Bull. Sci. Philom., ser. 7, iv, 1880, 57 {guichenoti) . 



Body much elongate; dorsals united, caudal free from dorsal and anal; 

 ventrals united, not adhering to belly; teeth small, the outer enlarged; 

 anterior part of body naked, posterior part covered with cycloid scales. 

 Otherwise as in Gohioides, from which the genus may not be sei^arable. 

 (Name from Cayenne.) 



2601. CAYEXNIA GUICHENOTI, Sauvage. 



Head 9 ; depth 17. D, VI, 17 ; A. I, 16 ; vertebrje about 36. Head deeper 

 than wide; eye small, placed well forward; maxillary reaching to below 

 posterior margin of eye; a low membrane connecting dorsal and caudal; 

 caiulal 7 in length; ventrals 11 in head. Color brownish, marbled with 

 black anteriorly, Cayenne (Sauvage); not seen by us. (Named for A. 

 Guichenot, formerly ichthyologist of the Museum d'Histoire Naturelle at 

 Paris.) 



Cayennia guichenoti, Sauvage, Bull. Soc. Pbilom., ser. 7, iv, 1880, 57 Cayenne ; Eigen- 

 MANN (fc ElGENMANN, Proc. Cal. Ac. Sci. 1888,76. 



Suborder DISCOCEPHALI. 



Bony fishes " with a suctorial transversely laminated oval disk on the 

 upper surface of the head (homologous with a llat dorsal fin), thoracic 

 ventral fins with external spines, a simple basis cranii, intermaxillary 

 bones llattened, with the ascending processes deflected sideways, and 

 with the supramaxillary bones attenuated backward, flattened, and 

 ajipressed to the dorsal surface of the intermaxillaries ; hypercoracoid (or 

 scapula) perforated nearly in the center, and with 4 short actinosts 

 (carpals)." (Gill.) 



This remarkable group consists of a single family, Echeneidida'. {SidHoi, 

 disk; KEqiaXij, head). 



Family CLXXXIX. ECHENEIDID^. 



(The Remoras.) 



Body fusiform, elongate, covered with minute, cycloid scales. Mouth 



wide, with villiform teeth on jaws, vomer, palatines, and usually on 



tongue. Premaxillaries not protractile. Lower jaw projecting beyond 



upper. Spinous dorsal modified into a sucking disk, which is placed on 



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