eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 209 



Pseudohypophthalmus Bleeker, Nederl. Tijdschr. Dierk., 1, 1863, 109 (fimbriatus = 

 edentatus) . 

 Type, Hypophthalmus edentatus Spix. 



79. Hypophthalmus edentatus Spix. 



Hypophthalmus edentatus Spix, Selecta Gen. et Spec. Pise. Bras., 1829, 16, pi. 9 

 (equatorial Brazil). — Gunther, Catalogue, V, 1864, 67 (copied). — Cope, Proc. 

 Am. Philos. Soc, XVII, 1878, 673 (Peruvian Amazon). — Eigenmann and 

 Eigenmann, Proc. Cal. Acad. Sci., (2), I, 1888, 120 (Para); Occasional Papers 

 Cal. Acad. Sci., I, 1890, 313.— Eigenmann and Bean, Proc. U. S. Nat. Mus., 

 XXXI, 1907, 664 (Amazon). — Eigenmann, Repts. Princeton Univ. Exp. Pata- 

 gonia, III, 1910, 398. 



Hypophthalmus marginatus Cuvier and Valenciennes, Hist. Nat. Poiss., XV, 

 1840, 225, pi. 439 (Cayenne; Surinam).— Gunther, Catalogue, V, 1864, 68 

 (copied).— Vaillant, Bull. Soc. Philom., (7), IV, 1880, 150 (Calderon).- 

 Wright, Trans. Roy. Soc. Canada, III, sect, iv, 1886, 107-118, pis. 8-10 

 (important paper on structure). — Perugia, Ann. Mus. Genova, (2), X, 1891, - 

 (Chaco Centrale). 



N otophthalmus marginatus Hyrtl, Denkschr. Akad. Wiss. Wien, XVI, 1859, 17 

 (vertebrae 2 + 5 + 54). 



Hypophthalmus longijilis Cuvier and Valenciennes, Hist. Nat. Poiss., XV, 1840, 



230 (Surinam). — Gunther, Catalogue, V, 1864, 68 (Demerara; Surinam).— 

 Bleeker, " Silures de Suriname," 1864, 88 (Surinam). 



Hypophthalmus spixii Cuvier and Valenciennes, Hist. Nat. Poiss., XV, 1840, 



231 (copied).— Kner, SB. Akad. Wiss. Wien, XXVI, 1857, 446 (Rio Branco). 

 Hypophthalmus cdentulus Castelnau, Anim. Am. Sud, Poiss., 1855, 47. 

 Hypophthalmus Jlmbriatus Kner, SB. Akad. Wiss. Wien, XXVI, 1857, 444, pi. 9, 



fig. 30 (Rio Negro). — Gunther, Catalogue, V, 1864, 68 (copied). 

 Hypophthalmus perporosus Cope, Proc. Am. Philos. Soc, XVII, 1878, 673 



(Nauta). — Steindachner, " Flussfische Sudamerika's," iv, 1882, 4 (Rio 



Huallaga; Rio Amazonas). 



Thirteen specimens, 270-485 mm. Wismar. (C. M. Cat. No. 1701a-c; I. 

 U. Cat. No. 12084.) 



One specimen, 445 mm. Morowhanna ? (C. M. Cat. No. 1702.) 



Head 3.8-4; depth 4.6-5; D. 1,6; A. 64-6S; eye about 10 in head; 5 in snout. 



Much compressed, snout depressed, head rounded above, its lower surface 

 flat, the eye at the lower margin of the head; jaws equal, the upper papery, the 



