2] 4 CHALCEUS LATUS. 



tical, smooth, and adhesive ; lateral line straight, 

 along the middle of the body ; teeth prominent, a 

 single row in each jaw ; tongue round and fleshy ; 

 intestines without any appendices; milt double, 

 running the length of the cavity ; air-bag double, — 

 the one long and pointed, the other oval." As the 

 drawing is coloured, the head and back are dark 

 olive green, the colour shading gradually to the 

 lateral line, where it becomes pale yellowish white 

 for the remaining half of the body ; all the fins are 

 of a uniform dull green, but the singular marking of 

 the fish is a deep black stripe of about half an inch 

 in breadth, which runs on the lateral line from the 

 centre of the fork of the tail, and terminates at two- 

 thirds the distance between the ventral and anal 

 fins. The vest is situate half an inch anterior to 

 the commencement of the anal fin. 



Another fish seems to range here, although the 

 shape is somewhat similar both to Serrasalmo and 

 Tetragonopterus. Our notes, however, rather agree 

 with the present genus. 



C. ? LATUS, Broad-formed Chalceus. — L. Ge- 

 RAL, Matapuri. Schomh. Drawings, No. 51. — " It 

 ■was taken by the hook in the Padauiri, a tributary 

 of the Rio Negro. The length is four inches to the 

 centre of the fork, while its depth below the dorsal 

 fin is two inches and a quarter. The scales are 

 large, elliptical, deciduous, and slightly fringed on 

 the posterior edge ; lateral line runs near the middle 

 of the body, slightly bending near the head. Tongue 

 is oval 3 teeth, a single row in each jaw i intestines 



