

SOUTH AMERICAN NEMATOGNATHI. 63 



the length of the head in height; distance of the adipose 

 fin from the dorsal 3\ in the length, the height of the 

 adipose fin about 2J in its length which is contained 2-f 

 in the length of the head. 



Caudal deeply forked, 5| in the length. 



Anterior two-thirds of the anal strongly convex, the 

 posterior third slightly emarginate, the highest ray 

 about 2| in head. 



Ventrals reaching to the anal, about two in the head, 

 their distance behind the dorsal is equal to the length of 

 the dorsal and half the dorsal plate. 



Pectoral spine granulose on sides, the outer margin 

 with a series of larger granules which become recurved 

 notches toward the tip, the inner edge with recurved 

 hooks, its height If in the length of the head. 



A small pectoral pore; no evident series of vertical 

 pores. 



Bluish gray above becoming white below, the fins 

 brownish with dots. 



Head 3J; depth 6; D. I, 7; A. 19. 



We have examined the type of alatus .68 m. long, 

 from Panama; collected by Dr. Steindachner. 



35, Tachisurus luniscutis, 



Arius luniscutis Cuv. & Val. Hist. Nat.Poiss. xv, 109, 1840 (Brazil); 



Kner, SB. Ak. Wien, xxvi, 1857, 390 (loc.?); Giinther, Cat. Fish. 



Brit. Mus. v, 152, 1864 (Brazil; Surinam). 

 Galeichthys luniscutis Jordan Proc. U. S. Nat. Mus. 1886, 559 (name 



only). 

 Tachisurus luniscutis Eigemn. & Eigenm. Proc. Cal. Acad. 2d. Ser. 



vol. i, 1888, 141 (Porto Alegre; Bahia; Nazareth, near Bahia; 



Kio Janeiro; Para; Porto Seguro; Sao Matheos; Cannavierias) . 

 Habitat: Kio Janeiro to Surinam. 



Body comparatively stout, the greatest width equaling 

 the greatest depth. Head large, flattish above; profile 

 descending; width of head 1J in its length, width at the 

 mouth, 2-2 J; its depth at the base of the occipital process 

 scarcely less than its greatest width. Top of head 



