450 MEMOIRS OF THE CARNEGIE MUSEUM 



293. Osteoglossum bicirrhosum Vandelli. 

 " Arowana." 



Osteoglossum bicirrhosum (ex Vandelli) Agassiz, Selecta Gen. et Spec. Pise. Bras., 



1829, 45 (Amazon). — Muller and Troschel, in Schomburgk, Reisen, III, 



1848, 338 (Rupununi; Takutu; Rio Branco; Amucu). — Gunther, Catalogue, 



VII, 1868, 378 (Para; British Guiana). — Steindachner, "Flussfische Siida- 



merika's," iv, 1882, 16 (Huallaga). — Eigenmann and Bean, Proc. U. S. Nat. 



Mus., XXXI, 1907, 666 (Amazon). — Eigenmann, Repts. Princeton Univ. 



Exp. Patagonia, III, 1910, 453. 

 Ischnosoma bicirrhosum Spix, Selecta Gen. et Spec. Pise. Bras., 1829, pi. 25 and A. 

 Osteoglossum vandellii Cuvier, Regne Animal, , 18 — , . — Cuvier and 



Valenciennes, Hist. Nat. Poiss., XIX, 1846, 294, pi. 571. 

 Osteoglossuvi arowana Schomburgk, Fishes Brit. Guiana, I, 1841, 205, pi. 12. 



Seven specimens, 232-312 mm. Rupununi. (C. M. Cat. No. 2416a-d; I. U. 

 Cat. No. 12551.) 



Specimens were seen at Crab Falls. 



Head 5+ ; depth 5.5; D. 45-48; A. 53-57; scales 3-35-2.5; eye 1 in the snout, 

 4 in the head, 1 in the interorbital. 



Elongate, compressed; back rounded, region behind the pectoral trenchant; 

 mouth very large, oblique; maxillary-premaxillary border 1.33 in the head; opercle 

 with a broad membraneous edge; thirteen rakers on the lower arch. Teeth all 

 small. 



Scales vertical, cycloid, decreasing in size toward the anal. Origin of dorsal 

 nearer to the caudal than to the eyes, the anterior rays feeble; origin of the anal 

 nearer to the snout than to its last ray; caudal small, rounded; ventrals reaching 

 past origin of the anal; pectorals large, nearly reaching the anal. 



Fins pink; sides ashy, each scale with a darker bar bordered with pink. 



Family XVI. ARAPAIMIDiE. 



Arapaima Muller. 



Sudis Cuvier, Regne Animal, II, 1817, 180. 



Arapaima Muller, Abhand. Akad. Wiss. Berlin, 1846, 191. 



Vastres Cuvier and Valenciennes, Hist. Nat. Poiss., XIX, 1846, 433. 



Type, Sudis gigas Cuvier. 



"Body elongate, compressed, head depressed, abdomen rounded. Mouth 

 wide, lower jaw prominent; no barbels; jaws with an outer series of conical, small 



