430 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
aa. [First dorsal with seven spines ; anterior profile evenly and rather strongly curved ; back regularly 
and more gently arched; eye Skinhead; forehead scaleless ; lateral line abruptly bent below 
second dorsal. Head, in length with caudal ; depth, 5^. D. VII, I, 10 ; A. Ill, 7. Scales, 
large, rough. Color, grayish above, paler below, becoming yellowish anteriorly.] (Peters.') 
Gracilis, 125. 
124. FERCILIA GILLISSII. 
Percilia gillissii Girard, Proc. Ac. Nat. Sci. Phila., VII, 1854, 197 (Rio de Maypu, Chili) ; Girard, U. S. 
Nav. Astron. Exped., ZooL, 235 (Rio de Maypu) ; Gunther, I, 255, 1859 (copied). 
Habitat . — Eivers of Chili. 
Etymology . — Ifamed for Lieutenant Gilliss, of the U. S. Naval Astronomical Ex- 
pedition. 
This species is known to us from the scanty original description only. 
125. PERCILIA GRACILIS. 
Percilia gracilis Peters, Berliner Monatsberichte, 1866, 708 (Rio Reine, Santiago de Chili). 
Habitat . — Rivers of Chili. 
Etymology. — Gracilis, slender. 
This species is known from Dr. Peters’s description only. It is probably identical 
with Percilia gillissii. 
