DORAS. 159 



vius, tab. iii. figs. 4, 5 ; (3.) Valenciennes, of D. 

 Cataphractus : — 



(1.) D. 1/5_P. 1/4_V,7— A. 12_C. 2-2_Br. 6. 



(2.) B 6 9 19 6.— Lat. pi. 29. 



(3.) 1/4 1/4 1/5 9 17 26. 



In the manner in whicli the numbers of Grono- 

 vius are expressed, we are not sure whether the 

 strong rays of the dorsal and pectoral fins are 

 counted or not ; if intended to be counted, the num- 

 bers would agree. In the specimen we find 12 in 

 the anal fin ; and in the tail, by taking within the 

 two exterior longest, we find 19 only, although 

 others on tha dorsal side, running shorter, make 

 up Mr. Schomburgk's number. Difierent observers 

 count in different ways, and confusion in numbers 

 have often in this way taken place. 



" This fish is a native of Rio Negro; is drawn of the 

 natural size ; the caudal fin is forked ; ventral placed 

 half distance between the pectoral and anal fins ; adi- 

 pose fin over the anal, small. The cranium is hard, 

 opercles striated; the mouth terminal; teeth fine, 

 thickly set in both jaws ; cirrhi on the upper longer 

 than those on the lower jaw; pectoral and dorsal 

 spines serrated; along the sides a series of scaly 

 plates, spined at the edge, and terminating at tlie 

 angle in the middle with a large spine ; a bony pro- 

 cess on the body, near the head, which the dorsal 

 spine lies against when it is closed. Colour of the 

 fish is olive-green, darker on the back, with late- 

 ral line white ; eyes yellow. Intestines form several 



