304 CLASSIFICATION OF FISHES^ ETC. 



Rliinelepes Spix. Plates smootlij but crenated at their 

 edges ; caudal fin smalls slightly lunate. 

 R. aspera. Spix and Agassiz, pi. 2. 



Plecostomiis Gron. Body lengthened; head short; 

 cirri none ; tail very long ; caudal fin lunate^ the 

 upper point lengthened into a filament. 



P. maculatus. Gronovius, pi. 2. Blocb, 375. fig. 2. 



HyposTOMA Lac. General structure of Loricaria, hut 

 ■with a small adipose dorsal ; cirri short ; caudal fin 

 large^ lunulate. 

 H.flava. Bloch, pi. 374. etentaculum. Sp. and Ag. pi. 1. 



HoPLisoMA Sw. Head and body compressed ; the 

 sides of the latter mailed with two series of crenated 

 plates ; dorsal fins two ; mouth terminal ; cirri mo- 

 derate ; tail long ; vent beneath the dorsal fin. 

 H. punctata. Bloch, 377. fig. 2. 



Cataphractus Gron. Head short, excessively broad 

 and depressed ; body mailed as in HopHsoma ; dorsal 

 fins two ; mouth rather beneath. 



C. depressus. Bloch, 377. 



Sturisoma Sw. Body very long and slender^ mailed^ 

 with two series of smooth plates ; muzzle produceds 

 depressed^ narrowed ; mouth beneath ; vent nearly 

 central ; dorsal fin single, placed over the ventral. 

 S. rostrata. Spix and Agassiz, pi. 3. 



2. SuBFAM. PIMELODIX.E. 



Body compressed, more or less naked ; dorsal fins two, 

 the hinder adipose ; muzzle not produced ; anal fin 

 short. 



Syngdontis Cut'. Body generally oval, compressed, 

 the sides naked ; cirri of the lower jaw pectinated ; 

 upper jaw longest ; lower teeth compressed, hooked, 

 pedunculated and flexible at their base ; head and 

 nape mailed, 

 ovata. Riipp. Nil. Fish. pi. 3. 2. serratis. lb. 2. f. 1. 



