p. HEMILIOPTERUS. 



169 



having the mouth with lengthened barbules; the 

 first rays of the pectoral and dorsal fins are strong 

 and spined. The generic characters are thus given, 

 and our woodcut copy from the drawing will illus- 

 trate the form : 



" Phractocephalus, Agassiz. — Denies velutini perfaseiam 

 latam in ossibus inter-maxillaribus, in vomere, in man- 

 dibvila, et in quinto radio branchiali. INIembrana bran- 

 chiostega radiis 8. Ox maximum. Cirrhi 6. Caput 

 latissum, scuto maximo ad nucham usque producto 

 tectum. Corpus nudum. Pinnae dorsales duae, posterior 

 adiposa ; radius primus pinnarum pectoralium validissi- 

 mus, serratus." 



P. Hemilopterus, Agas. — Pirarara bicolor, Spix, 

 -tab. vi. — Phractocephalus bicolor, Agas. in Spix. — 

 Le Phractocephale hemiliotere, Valenc. xv. p. 3. — 

 Paruaruima, ScJiomb. Drawings^ (1). — There ap- 

 pears yet to be only one species of this genus disco- 

 vered, and our drawing agrees generally with the 

 figure given in Spix; in it, the first spine of the 

 pectoral fin is represented as serrated on^both sides ; 

 in Schomburgk's figure, it is serrated only towards 

 the point of the inner side. In the first, the lateral 



