26 



U. S. p. R. R EXP. AND SURVEYS — ZOOLOGY — GENERAL REPORT. 



List of specimens. 



5. POMOTIS POPEII, Grcl. 



Spec. Char. — Body sub-elliptical in profile. Heid and mouth small ; snout bluntly sub-conical. Posterior extremity of 

 maxillary extending to a vertical line scarcely intersecting tlie anterior rim of the orbit. Eye small. Edge of preopercle not 

 denticulated. Opercular flap moderate. Tips of ventrals overlapping the vent without reaching the anterior margin of the 

 anal. Extremities of pectorals not extending as far back as the ventrals. Origin of dorsal fin situated opposite the insertion of 

 the ventrals. Uniform reddish brown ; fins olivaceous. 



In its general aspect this species greatly resembles P. aquilensis, from which it differs by 

 a proportionally smaller head, hence a smaller mouth, for, the posterior extremity of the 

 maxillarj', reaches a vertical line falling a little in advance of the anterior rim of the orbit. 

 The edge of the preopercle is perfectly smooth. A vertical line drawn from the origin of the 

 dorsal fin intersects the origin of the ventrals in passing behind the base of the pectoral fins. 

 The head constitutes a little less than the fourth, not quite the third of the entire length. The 

 posterior margin of the caudal is sub-crescentic, being more deeply cmarginated than in 

 P. aquilensis. The branchiostegal rays are five on either side. The fins rays number as in the 

 preceding species. The scales are well developed, especially upon the middle of tlie flanks, 

 being quite reduced in size under the thoracic arch; they are finely, though conspicuously, pecti- 

 nated posteriorly. 



The color is of a reddish-brown hue, rather pale upon the specimens preserved in alcohol. 

 An obsolete black patch may be observed upon the posterior and basal portion of the dorsal fin. 

 This patch, in all probability, is more apparent on the living specimens. The fins otherwise 

 are olivaceous, the inferior ones being tinged with grey. 



