468 Annals of the Carnegie Museum. 



cal, free from the anal; both pectorals present; vomer toothless; lateral 

 line with an anterior arch. These genera may be classified as follows: 



a'. Interorbital alike in the two sexes, usually a narrow ridge, but in some species of 

 moderate width and concave; spines of head present in both sexes, or absent. 

 b^. Right ventral not elongate. 



d. Teeth developed on both sides of jaws; gill-rakers developed. 

 d^. Rostral spines absent. 



e^. Scales cycloid, or nearly so, very thin and deciduous; mouth 



large Arnoglossus. 



e^. Scales ctenoid, firmer; mouth very small; no anterior dorsal 



crest Psetlina. 



cP. Rostral spines present; anterior dorsal rays produced into a high 



crest; scales fine, ctenoid Lophonectes. 



c^. Teeth on blind side of jaws only; gill-rakers obsolete, interorbital with 



a retrorse spine Engyophrys. 



62. Right ventral elongate; no spines on head Trichopsetta. 



Or. Secondary sexual differences great; the interorbital region greatly widened in 

 the males; rostral and ocular spines developed only in the males; pectoral fin 

 of eyed side elongate in males; scales ctenoid. 

 p. Dorsal fin not produced anteriorly. 



gi. Scales fine Plalophrys. 



p. Dorsal fin produced anteriorly; scales moderate Perissias. 



g^. Scales coarse Engyprosopon. 



The species of the preceding genera are distributed as follows: 

 Arnoglossus, of eastern Atlantic, Indo- Asiatic and Australian faunas; 

 Psettina, which originally based on one Japanese species,^ probably 

 includes also a Black Sea species, recently described by Schmidt^ as 

 Arnoglossus kessleri, as that species also has ctenoid scales and a very 

 small mouth; Lophonectes, with one Australian species; Engyophrys, 

 with one species belonging to the fauna of Panama; Trichopsetta, with 

 one species of the western Atlantic; Platophrys, containing many 

 species found in all the tropical seas; Engyprosopon, of the Indo- 

 Asiatic faunae; and Perissias, with a single species from the coasts of 

 Lower California. 



6 Hubbs, 1. c, p. 456. 



' Schmidt, Ann. Mag. Nat. Hist., Vol. 16, 1915, p. 108. 



