332 Field Museum of Natural History — Zoology, Vol. X. 



Body rather robust, posteriorly compressed; head depressed, wider 

 than deep; snout short, 3.65 to 4.25 in head; eye 3.2 to 3.8; interorbital 

 2.2 to 2.65; mouth small, the cleft scarcely lateral; teeth pointed, in 

 bands in the jaws, the outer ones somewhat enlarged, curved inward; 

 scales rather small, cycloid, the circulas strongly developed; 8 longitu- 

 dinal rows of scales between base of dorsal and base of anal; origin of 

 dorsal over middle of base of anal or slightly posterior to this point, and 

 somewhat nearer tip of caudal than posterior margin of eye, the 

 base of its last ray slightly behind vertical from base of last ray of 

 anal; caudal fin rounded; anal fin inserted midway between the tip of 

 snout and tip of caudal or slightly nearer the former, its margin convex, 

 the length of the base equal to the greatest width of head; ventral 

 fins small, about as long as diameter of eye, reaching vent; pectoral 

 fins moderate, failing quite notably to reach base of ventrals, 1.6 to 1.8 

 in head. 



Color brownish, sides more or less speckled with darker; dorsal and 

 caudal with or without faint, dark spots; a black stripe from imder side 

 of caudal peduncle to end of caudal rays usually present, forming an 

 intramarginal bar; on some specimens there is a similar bar on the 

 upper lobe of the caudal fin, although less distinct. In Hfe the upper 

 parts of the body are grayish with shades of pink, and the belly is pale 

 and also has a shade of pink. The fins are all reddish, and the base of 

 caudal and anal are deep red. 



Of this species we have 17 specimens, ranging in length from 35 to 

 50 mm. All are from the upper course of a small creek at Toro Point. 



Order IV. Acanthopterygii. 



The Spiny-rayed Fishes. 



Spines normally present in the anterior part of the dorsal and anal 

 fins; border of the mouth formed by the premaxillary; ventral fins 

 usually thoracic; anterior vertebrae unmodified; opercular bones all 

 present. 



r 



Family DC. Mugilidae. 



Body elongate, more or less compressed; mouth small, terminal or 

 inferior; teeth, if present, small, various in form; premaxillaries pro- 

 tractile; gill-openings wide, the membranes free from the isthmus; 

 gill-rakers usually long and slender; gills 4, a slit behind the fourth; 



