. The freshwater fishes of British Guiana, including a study of the ecological grouping of species and the relation of the fauna of the plateau to that of the lowlands . ana); in Schomburgk, Reisen, III, 1848, 636 (Cuyuni).—Cuvier andValenciennes, Hist. Nat. Poiss., 1848, 347.—Gunther, Catalogue, V, 1864,344.—Eigenmann and Eigenmann, Proc. U. S. Nat, Mus., XIV, 1891, 57 —Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, in the length; depth somewhat less than the length of the head; A. 30; lateral line 39, silvery. This species, which greatly resembles Hydrolycus scomb
. The freshwater fishes of British Guiana, including a study of the ecological grouping of species and the relation of the fauna of the plateau to that of the lowlands . ana); in Schomburgk, Reisen, III, 1848, 636 (Cuyuni).—Cuvier andValenciennes, Hist. Nat. Poiss., 1848, 347.—Gunther, Catalogue, V, 1864,344.—Eigenmann and Eigenmann, Proc. U. S. Nat, Mus., XIV, 1891, 57 —Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, in the length; depth somewhat less than the length of the head; A. 30; lateral line 39, silvery. This species, which greatly resembles Hydrolycus scomberoides, is known from the type only, about 100 mm. long, in the Berlin Museum. 318 MEMOIRS OF THE CARNEGIE MUSEUM Subfamily Tetragonopterin^e. As a full account of the Tetragonopterinae is about to be published in theMemoirs of the Museum of Comparative Zoology, the account of these species givenin this work is, therefore, made brief. Tetragonopterus Cuvier. Tetragonoptrus Artedi, in Seba, Locupl. Rer. Nat. Thes. Ace. Descr., Ill, 1748, pi. 34, fig. Cuvier, Regne Animal, II, 1817, 166 (argenteus). Type, Tetragonopterus argenteus Fig. 37. Tetragonopterus argenteus Cuvier. No. 20718 Mus. Comp. Zool. The depth at least half the length; humped at the occiput; concave over theeyes; premaxillary teeth in two rows, those of the outer series small, of nearlyuniform size, the row more or less regular, those of the inner series larger, graduated,multicuspid, the cusps of each tooth arranged in a curve, the middle cusp much thelongest; several large, graduated, pointed teeth in the front of the lower jaw, andabruptly minute teeth on the sides; maxillary with or without teeth on its upperanterior edge; preventral area flat, bounded by sharp angles; a median series ofscales on the breast. eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 319 Key to the Guiana Species of Tetragonopterus. <i. A. 36; scales in front of dorsal crowded, about fifteen in th
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