SOUTH AMERICAN NEMATOGNATHI. 55 



and behind, joined to the subtriangular palatine patches; 

 pterygoid patches long-elliptical. 



Gill membrane with a narrower free margin than in 

 brandtii. 



Distance of dorsal fin from tip of snout 2f in the 

 length, the dorsal spine 1^ in the head, granular in 

 front, recurved teeth on its inner margin. Distance be- 

 tween the dorsal and adipose fins 3 in the length; adi- 

 pose fin about as long as the dorsal fin. 



Caudal deeply forked, the upper lobe longer, 3f in the 

 length. Anal little longer than high. Ventrals reach- 

 ing nearly to the anal, about 2 in the head. 



Pectoral spine 1 J in the head, its outer margin granu- 

 lar, the inner rather finely toothed. 



The skin on the dorsal surface of the head and 

 humeral region finely reticulate with mucous canals. 



Yellowish brown, lighter below, the fins yellowish, 

 finely punctulate. 



Head 3|; depth 6; D. I, 7; A. 18. 



One specimen .51 m. Surinam. 



28, Tachisurus brandtii, 



? Sciades troschelii Gill, Proc. Acad. Nat. Sci. Philad. 1863, 171 (West 



Coast Central America). 

 ? Arius troschelii Giinther, Cat. Fish. Brit. Mus. v, 150, 1864 (copied); 



ib. Fish. Cent. Am. vi, 1866, 393 (Pac.) 

 t Galeichthys troschelii Jordan, Proc.U. S. Nat. Mus. 1885, 366 (name 



only). 

 Arius brandtii Steindachner, SB. Ak. Wien, Ixxiv, 1876, Ichthyol. 



Beitr. iv, 21, pi. iii (Altata, Panama); Jordan & Gilbert, Bull. 



U. S. Fish. Comm. 1882, 37, 39 (Mazatlan; Punta Arenas; 



Panama). Jordan & Gilbert. Proc. U. S. Nat. Mus. 1882, 621 



(Panama). 

 Galeichthys brandti Jordan, Proc. U. S. Nat. Mus. 1885, 365 (name 



only). 

 Tachisurus brandti Eigenm. & Eigenm., Proc. Cal. Acad. 2d Ser. 



vol. i, 1888, 141 (Panama). 

 Habitat: West Coast tropical America. 



The description of S. troschelii is evidently (dentition) 



