THE SHORE FISHES OF PERU 493 



second behind pectorals; third in front of dorsal; fourth on base of 

 dorsal ; fifth on middle of caudal peduncle and sixth in front of base of 

 caudal; fins yellowish, punctulate with dusky. This description is 

 based on a specimen 11.5 cm. long." 



This species was not taken by the Mission. The description, 

 exclusive of the color, is based on six specimens from Peru, all without 

 precise labels as to locahty. Five 73 to 100 mm. (58 to 89 mm. to 

 base of caudal) long, were taken by R. E. Coker, and the sixth, 195 

 mm. (160 mm. to base of caudal) long, is included in the collection of 

 the Wilkes Exploring Expedition. 



Range. — Coasts of Peru and Chile. 



Genus SICYOGASTER Brisout, 1846 



Snout with a rather broadly convex margin, formed by the pre- 

 maxillaries and lip; premaxillary groove medianly nearly straight; 

 teeth in upper jaw not definitely incisorlike, anteriorly in 2 irregiUar 

 series; teeth in anterior part of lower jaw compressed, incisorlike, 

 but with convex or somewhat pointed smooth cutting edges, projecting 

 obliquely forward; opercular spine fairly short, not projecting beyond 

 membranous margin above it; gill membranes united, with margin 

 free from isthmus, attached to shoulder in front of uppermost ray of 

 pectoral; dorsal and anal rather long, the former with about 11 to 16 

 rays, and the latter with about 10 to 14 (enumerations given in the 

 following description include only the rays visible without dissection) ; 

 origin of anal under anterior third of dorsal. 



One species is known from Peru. 



SICYOGASTER MARMORATUS (Jenyns) 



Gobiesox marmoratus Jenyns, 1842, p. 140, pi. 27, figs. 1, la, and lb, "Chiloe Archi- 

 pelago," Chile (original description). 



Sicyogaster marmoratus Schultz, 1944, pp. 53, 70, Peru and Chile (diagnosis; 

 synonymy; list of specimens examined). 



Head (to tip of opercular spine) 3.0; depth 5.2; D. 11 ; A. 9; P. 18. 



Head and body anterior to vent much depressed; tail compressed' 

 head nearly as broad as long, its width 3.1 in length; caudal peduncle 

 slender, 4.25 in head; snout broadly convex, 2.7; eye 5.7; interorbital 

 flat, without raised orbital rim, 2.8; mouth small, its posterior 

 angle about under posterior nostril; premaxillaries with lip medianly 

 about three-fourths diameter of eye; teeth in upper jaw not 

 distinctly incisorlilve, scarcely if at all broadened, rather small, 

 unequal in size, irregularly in two series anteriorly, extending back 

 nearly to angle of mouth; anterior teeth in lower jaw larger, definitely 

 compressed, with smooth convex cutting edges, becoming smaller and 

 more pointed laterally, extending to angle of mouth; anterior nostril 

 with a low tube, ending in a simple or bifid tentacle on its posterior 



