472 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



having the mouth terminal and the jaws curved, whereas the lower 

 jaw projects and both jaws are straight in crossotus; in having the 

 third ray of the pectoral free distally and produced, which is not true 

 of crossotus; and in several minor respects. It is near E. longimanus 

 Norman, known from the coasts of Brazil and Argentina, with which 

 it agrees, according to Norman's description and figure, in the pro- 

 longed ray of the pectoral, and approximately in the elongate body, 

 the depth being contained in the length in longimanus 2.25 to 2.5. It 

 seems to differ in having a slightly larger mouth, as the maxillary 

 reaches under the anterior margin of the pupil, whereas in longimanus 

 it reaches under the anterior margin of the eye. Furthermore, the 

 jaws are distinctly curved, whereas they are shown as straight in 

 longimanus; the eyes are equally advanced in peruvianus, while in 

 longimanus the lower is a little in advance of the upper one. Enumera- 

 tions indicate slight differences in the number of gill rakers, and pec- 

 toral rays, as peruvianus has 9 gill rakers on the lower limb of first 

 arch, instead of 6 or 7, and 10 instead of 9 rays in the pectoral. 

 Range. — Panama Bay to northern Peru. 



Family SOLEIDAE: Broad Soles 



Body oblong or oval; eyes small, close together on right side; pre- 

 opercle without a free margin, being hidden by skin and scales ; caudal 

 fin free from the dorsal and anal; ventral of ocular side free or con- 

 tinuous with the anal. 



A single genus, new to the fauna of Peru, is included. 



Genus ACHIRUS Lacepede, 1802 



Body oval, broadly rounded anteriorly; mouth small, turned to 

 ocular side; teeth minute or wanting; gill openings not confluent below; 

 scales strongly ctenoid on both sides; first ray of dorsal over snout; 

 ventral fins present, the one of ocular side continuous with anal; pec- 

 toral of ocular side small or obsolete, none on blind side. 



A single species, previously unlvnown from Peru, is included, 



ACfflRUS FIMBRIATUS (Gunther) 



Solea fimbriata Gunther, 1862, p. 477, Gulf of Fonseca, El Salvador; Nicaragua 

 (original description). 



Achirus fimbriatus Meek and Hildebrand, 1928, p. 1001, pi. 102, fig. 1, Pan- 

 ama Bay (synonymy; description; range). 



Head 3.4; depth 1.65; D. 54; A. 34; scales about 75. 



Body ovate, anteriorly broadly rounded; head short, deep; caudal 

 peduncle very short, deep, 2.0 in head; snout short, broadly convex, 

 its length in advance of lower eye 3.7; eyes very small, about equally 

 advanced (the upper in advance of lower one in a larger specimen from 

 Panama Bay), about a third length of snout, and 10 in head; inter- 



