180 siltjridjE. 



Gill, Proc. Acad. Nat. Sc. Philad. i863, p. 172, but that author de- 

 scribes his species as having the head longer, the ventral fins shorter, 

 and the anal placed more forwards. Besides, the shape of the dorsal 

 buckler in our species is so different from that of the other uSSlurich- 

 thyes, that probably he would have made it the type of one of his new 

 generic names, if he had had the same species, or one closely allied 

 to it. 



65. PARADIPLOMYSTAX. 



Paradiplomystes, Bleek. Nederl. Tydschr. Dierk. 1863, p. 92. 



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

 with seven soft rays ; anal rather short. Barbels two : one to each 

 maxillary, of moderate length, band-like. Bands of small teeth in 

 the jaws and on the palate. Caudal forked. 



Brazil. 



1. Paradiplomystax coruscans. 

 Pimelodes coruscans, Licht, Wiedem. Zool. Mag. i. pars 3. p. 58. 

 B. 7. D. 1/7. A. 13. P. 1/8. 

 Nuchal shield keeled. The maxillary barbels extend nearly to the 

 middle of the body. The upper jaw is a little longer than the lower. 

 Cleft of the mouth wide ; eye immediately above the angle of the 

 mouth. (Licht.) 

 Brazil. 



I have not seen this species, which, to judge from the description, 

 must be closely allied to Mlurichthys. 



66. DIPLOMYSTAX. 



Diplomyste, sp., Dumeril, Ichth. Analyt. p. 487. 

 Diplomystes, Bleek. Nederl. Tydschr. Dierk. 1863, p. 92. 



Adipose fin rather elongate ; a short dorsal fin with a pungent 

 spine and with seven soft rays ; anal fin rather short. Barbels two, 

 short, fleshy, belonging to the maxillaries. Lips fleshy, covered with 

 papillae, the upper prominent. Bands of villiform teeth in the inter- 

 maxillary, maxillary, and in the lower jaw; two groups of small 

 obtuse teeth on the vomer. Caudal forked ; ventral fins with six 

 rays, inserted below the end of the dorsal. Gill-openings wide, sub- 

 continuous 



Chile. 



1. Diplomystax papillosus. 



Arius papillosus, Cuv. 8f Vol. xv. p. 118. pi. 431 ; Gay, Hist. Chil. Zool. 

 Fish. p. 305. 



B. 8. D. 1/7. A. 12-13. P. 1/9. Vert. 14/25. 



The entire head covered with soft skin ; dorsal spine not serrated. 

 The teeth form a broad band on the intermaxillary, and a narrow 

 one on the maxillary. 



Rivers of Valparaiso and San Jago. 

 a. Chile. 



