[85] FLOUNDERS AND SOLES. 309 



and Cuvier regarded the species called by ns fasciatus as the type of 

 their genus Achirus. 



ANALYSIS OF SPECIES OF ACHIRUS.* 



a. Pectoral fins small ; present at least on the right side. (Baiostoma Bean.) 



h. Pectoral fin present on both sides, that of the left side rudimentary, of a single 

 ray ; that of the eyed side with about 3. 

 c. [Dorsal rays 60 to 07 ; anal rays about 48 ; lat. 1. 80 ; depth 1 1 in length ; colo r 

 brownish, irregularly spotted with darker, and with about 

 10 black vertical lines crossing the lateral line.] (G an- 

 ther) Achirus, 105. 



cc. Dorsal rays 53 to 57 ; anal rays 40 to 42 ; lat. 1. 75 to 80 ; depth If in length ; 

 scales smaller and less rough than usual in this genus, 

 those of nape scarcely enlarged on eyed side, those of blind 

 side much fringed ; scales of colored side with scattered, 

 hair-like appendages, some black, others pale ; color oliva- 

 ceous; head, body, dorsal, and anal fins covered with a net- 

 work of dark lines ; traces of about 8 dark cross-streaks 

 sometimes present; caudal fin yellowish, nearly plain, or 

 with a few dark dots or reticulations ; its base dusky. 



Vertebrae 8 -f 20 = 28 Inscriptus, 106. 



hb. Pectoral of right side only present. 



d. Dorsal rays 65 to 66 ; anal rays 48 to 51. 



e. Pectoral well developed, with about 6 rays. Scales of eyed side without 

 hair-like filaments ; scales of lateral line 77 to 80 ; chin 

 little prominent ; dorsal rays 65 ; anal rays 51 ; depth 14 

 in length ; head 3f ; right lower lip fringed. Color brown- 

 ish, with 9 or 10 narrow blackish cross-lines ; small 

 rounded blackish spots on the membranes of each of the 



vertical fins, much as in A. lineatus Klunzingeri, 107. 



ee. Pectoral fin small, its rays about 2 in number ; scales of eyed side with 

 numerous hair-like filaments ; scales of lateral line about 

 70; chin prominent, protruding beyond upper jaw ; D. 66, 

 A. 48 to 50 ; depth If in length ; pectoral black, not much 

 longer than eye ; eyes rather large, the upper not in ad- 

 vance of lower ; color brown, with traces of dark cross- 

 bands ; numerous irregular blackish clouds and blotches on 



the body and fins; no small spots Mentalis, 108. 



dd. Dorsal rays, 50 to 58 ; anal rays, 35 to 47. 



/. Pectoral fin of 4 to 6 rays, considerably longer than eye ; body with 8 to 

 10 narrow vertical dark bars, these sometimes obsolete 

 with age. 

 g. Vertical fins, all with round dark spots, these usually especially distinct 

 on the caudal fin ; some of the scales of eyed side with 

 black, hair-like appendages ; pectoral fin with 5 or 6 rays, 

 about 3 in head ; its length equal to that from outer edge 

 of one eye to outer edge of another ; head 3^ in length . 

 depth about H 5 color brown, the young spotted with 

 whitish, the adult sometimes with darker ; body with about 

 8 narrow vertical cross-streaks of blackish. Lineatus, 109. 

 x. Dorsal rays 49 to 58 ; anal rays 38 to 44 ; scales 70 to 85. 



Var. lineatus, 109 (a). 



* Besides the species here mentioned, another, Achirus lorentzi Weyenbergh (Algunos 

 Nuevos Pescados del Museo Nacional y Algunas Noticias Ictiologicas 1877, 13, pi. 1, 

 f. 1— Buenos Ayres), has been described from Santa Fe\ Uruguay. We have not seen 

 the description. 



