236 FISHES OF WESTERN SOUTH AMERICA 
Type: Tetragonopterus argenteus Cuvier 
Guianas to Orinoco, Rio de Janeiro, and La Plata basin 
Depth half the length or greater; occipital region elevated, with profile de- 
pressed at eye; premaxillary teeth in two rows, the outer series small, regular, inner 
series longer, multicuspid, graduated, the cusps of each tooth forming a curved 
figure, the middle cusp much the most elevated; several large, graduated, pointed 
teeth in the mandible at the middle, becoming abruptly minute at the sides; maxil- 
lary toothed or not at its upper, anterior edge. Preventral area flat, bounded by 
sharp angles; breast with a median series of scales. 
Fria. 27. An equipage suitable for a somewhat nomadic bache- 
lor. He had named it the “Thime Is Money.” The boat and its 
owner were helpful in assembling the collections made about the 
Rio Pacaya. 
286. TETRAGONOPTERUS ARGENTEUS Cuvier 
Tetragonopterus argenteus Cuvier, 1818, Mém. Mus. Hist. Nat., IV, 455; 
Cuvier and Valenciennes, 1848, Hist. Nat. Poiss., XXII, 132; 
Giinther, 1864, Cat. Fish. Brit. Mus., V, 318; 
Steindachner, 1882 (1883), Denksch. KI<. Akad. Wiss. Wien, XLVI, 13, Amazon, Iquitos, 
two specimens; 
Eigenmann and Eigenmann, 1891, Proc. U.S. Nat. Mus., XIV, 52; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 438; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 319; 
Eigenmann, 1917, Mem. Mus. Comp. Zool., XLII, i, 55, pl. ii, fig. 1; pl. iv, fig. 2; 
Fowler, 1939 (1940), Proc. Acad. Nat. Sci. Phila., XCI, 263, five. 
Orinoco basin to that of the Plata 
15615, 1, 97 mm., Lago Sanango, Allen, November, 1920. 
15616, 5, 47-88 mm., Rio Morona, Allen, October, 1920. 
15617, 2, 103 and 116 mm., Alto Maranon, Allen, October, 1920. 
