ANNOTATED LIST OF THE SPECIES 387 
The largest of the above specimens was 250 mm. The species is known 
throughout the Amazons, the Orinoco basin, and the Guianas. — It is another of the 
relict marine ichthyfauna of the Amazon. 
494. PLAGIOSCION AURATUM (Castelnau) 
Johnius auratus Castelnau, 1855, Anim. Amér. Sud, Poiss., 12, pl. iv, fig. 2, Rio Ucayali. 
Sciaena aurata Giinther, 1860, Cat. Fish. Brit. Mus., II, 287. 
Plagioscion auratus Jordan and Eigenmann, 1886 (1889), Rept. U.S. Fish Comm., 383; 
Eigenmann and Eigenmann, 1891, Proc. U.S. Nat. Mus., XIV, 67; 
Higenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 468; 
Higenmann, 1912, Mem. Carnegie Mus., V, 472. 
Plagioscion auratus iquitensis Nakashima, 1941, Bol. Mus. Hist. Nat. Lima, V, 67. 
Guianas, Rios Apuré, Sao Francisco, Peruvian Amazons 
Family XXII: Cichlidae 
Genus 200: CHAETOBRANCHUS Heckel 
Chaetobranchus Heckel, 1840, Ann. Wiener Mus., IT, 401; 
Giinther, 1862, Cat. Fish. Brit. Mus., IV, 309; 
Eigenmann and Higenmann, 1891, Proc. U.S. Nat. Mus., XIV, 70; 
Pellegrin, 1904, Bull. Soc. Zool. France, XXTX, 200; 
Higenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 469; 
Higenmann, 1912, Mem. Carnegie Mus., V, 483. 
Type: Chaetobranchus flavescens Heckel 
The Guianas to the Rio Guaporé 
Most readily to be distinguished from other Cichlidae by the exceptional 
length of the numerous, setiform gill-rakers. 
495. CHAETOBRANCHUS FLAVESCENS Heckel 
Chaetobranchus flavescens Heckel, 1840, Ann. Wiener Mus., II, 401; 
Miller and Troschel in Schomburgk, 1848, Reisen, IIT, 625; 
Gunther, 1862, Cat. Fish. Brit. Mus., IV, 310; 
Eigenmann and Higenmann, 1891, Proce. U. 8. Nat. Mus., XIV, 70; 
Pellegrin, 1902, Bull. Mus. Hist. Nat., VIII, 182; 
Pellegrin, 1903 (1904), Mém. Soc. Zool. France, XVI, 190, 200; 
Bigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 469; 
Eigenmann, 1912, Mem. Carnegie Mus., V, 485; 
Fowler, 1939 (1940), Proc. Acad. Nat. Sei. Phila., XCI, 280, one, 118 mm., Contamana. 
Aquidens flavescens ? Haseman, 1911e, Ann. Carnegie Mus., VII, 338. 
Chromys ucayalensis Castelnau, 1855, Anim. Amér. Sud, Poiss., 15, pl. vi, fig. 2, one, Sarayacu. 
Geophagus badiipinnis Cope, 1871, Proc. Acad. Nat. Sci. Phila., XXIII, 251, pl. x, fig. 1, R. 
Ambyiacu. 
Widely dispersed Guianas to the Guaporé 
17750, 6, 115-195 mm., Lago Cashiboya, Allen, August, 1920. 
17751, 2, 102 and 105 mm., pond, Iquitcs, Allen, September, 1920. 
