EIGENMANN: the freshwater fishes of BRITISH GUIANA 443 



285. Symbranchus marmoratus Bloch. 



Synbranchus marmoratus Bloch, Ausl. Fische, IX, 1795, 87, pi. 418. — Muller and 

 Troschel, in Schomburgk, Reisen, III, 1848, 640 (drains of plantations). — 

 GiJNTHER, Catalogue, VIII, 1870, 15. — Steindachner, "Fisch-fauna des 

 Cauca,"etc., 1880, 38 (Cauca).— Cope, Proc. Am. Philos. Soc, XXXIII, 1893, 

 102 (Rio Grande do Sul).— Eigenmann, Ann. N. Y.Acad. Sci., VII, 1894, 625 

 (Para), 632 (Rio Grande do Sul). — Boulenger, Boll. Mus. Zool. ed Anat. 

 Comp. Torino, X, 1895,— (Asuncion); XII, 1897, — (Mission San Fran- 

 cisco). — Lahille, Rev. Mus. la Plata, VI, 1895, 270 (in aU the rivulets). — 

 Jordan and Evermann, Bull. U. S. Nat. Mus. No. 47, 1898, 342.— Bou- 

 lenger, Boll. Mus. Zool. ed Anat. Comp. Torino, XV, 1900, — (Caranda- 

 sinlio).— Eigenmann, Bull. U. S. Fish Com., XXII, 1903, 222 (Pinar del Rio, 

 Cuba).— Meek, "Fresh-water Fishes of Mexico," 1904, 89.— Miller, Bull. Am. 

 Mus. Nat. Hist., XXIII, 1907, 99 (Los Amatcs, Guatemala). — Eigenmann, 

 Repts. Princeton Univ. Exp. Patagonia, III, 1910, 450. 



Synbranchus immaculatus Bloch, Ausl. Fische, IX, 1795, pi. 419, fig. 1. 



Synbranchus transversalis Bloch and Schneider, Syst. Ichth., 1801, 524 (Guinea). 

 (After Gronow.) 



Unibranchapertura grisea, marmorata, immaculata, and lineata Lacepede, Hist. 

 Nat. Poiss., V, 1803, 658 (Surinam). 



Synbranchus fuliginosus Ranzani, Nov. Com. Acad. Sci. Inst. Bonon., IV, 1840, 

 75, pi. 11, fig. 1 (Brazil). 



MurcBua lumbricus Gronow, Cat. Fish, ed. Gray, 1854, 18 (Sea of Guinea). 



Sijmbranchus vittatus Castelnau, Anim. Am. Sud, Poiss., 1855, 84, pi. 44, fig. 3 

 (Rio de Janeiro). 



One specimen, 670 mm. Rupununi. (C. M. Cat. No. 2437.) 

 One specimen, 405 mm. Rockstone sand-bank. (I. U. Cat. No. 12565.) 

 Dark brown above, speckled below. 



Order ISOSPONDYLI. 



Key to the Families of Isospondyli. 



a. A gular plate between the branches of the lower jaw Elopidae, XII. 



aa. No g,ular plate. 



h. No lateral line; .species small, largely marine. 



c. Mouth moderate, terminal, the maxillary of three pieces Clupeidse, XIII. 



X. Mouth subinfcrior, very large; maxillary long Engraulidae, XIV. 



hh. Lateral line well-developed; fresh- water species, some of them of large size. 



d. Anal long; head compressed; mouth large; belly compressed to an edge Osteoglossidae, XV. 



dd. Anal short; head depressed; belly rounded Arapaimidae, XVI. 



