EIGENMANN: THE FRESHWATER FISHES OF BRITISH GUIANA 525 



Guavina guavina Jordan and Eigenmann, Proc. U. S. Nat. Mus., 18S6, 483.— 

 Jordan and Evermann, Bull. U. S. Nat. Mus. Xo. 47, III, 1896, 2198.— Eigen- 

 mann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 4S0. 

 No specimens were obtained. It was taken by Schomburgk, one of whose 



specimens is in the Berlin Museum. 



Head 3.5; depth 4.5-5.25; D. VI, or VII-1,10; A. 1,9 or 10; maxillary 



2.5-3.5 in the head. Maxillary reaching opposite middle of eye; scales 100-110 



in a longitudinal series. 



Evorthodus Gill. 



Evorthodus Gill, Proc. Acad. Nat. Sci. Phila., 1859, 195. 



Type, Evorthodus breviceps Gill. 



Ventrals united, free from the abdomen; teeth emarginate, in a single scries; 

 head very blunt; interorbital very narrow. 



358. Evorthodus breviceps Gill. 



Evorthodus breviceps Gill, Proc. Acad. Nat. Sci. Phila,, 1859, 195 (Trinidad).— 

 Gunther, Catalogue, III, 1861, 85 (Trinidad; Surinam). — Jordan and Eigen- 

 mann, Proc. U. S. Nat. Mus., IX, 1886, 486. — Jordan and Evermann, Bull. 

 U. S. Nat. Mus. No. 47, III, 1898, 2208.— Regan, Proc. Zool. Soc. London, 

 1906, i, 393 (Trinidad). — Eigenmann, Repts. Princeton Univ. Exp. Patagonia, 

 III, 1910, 481. 

 Two specimens, 30-33 mm. Aruka River. (C. M. Cat. No. 2441 ; I. U. ( at . 



No. 12555.) 



Head 4; depth 4.33; D. V,ll; A. 12; scales 30; eye 3+ in the head, .25 in 



the interorbital. 



Head very blunt, the mouth low, horizontal; gill-membranes broadly united 



to the isthmus, which is greater than the orbit, Scales of breast and before dorsal 



and on belly small, those of the sides large, eleven scales between the anus and the 



spinous dorsal. 



Sides mottled; tail with three cross-shades; a black spot at the base of each 



caudal lobe; first dorsal with a black band. 



Order HETEROSOMATA. 

 Family XXVI. SOLEID.E. 



Key to the Guiana Genera of Soleid.e. 

 a. Gill-openings large, confluent below; ventrals of the two sides of nearly equal size; caudal free from the dorsal 

 and anal; scales ctenoid, those of the head enlarged, the scales on the blind side of the head fringed. 



Achirus. 



