[85] FLOUNDERS AND SOLES. 309 
and Cuvier regarded the species called by us 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.) 
b. Pectoral fin present on both sides, that of the left side rudimentary, of a single 
ray; that of the eyed side with about 3. 
¢. [Dorsal rays 60 to 67 ; anal rays about 48; lat. 1.80; depth 1% in length; color 
brownish, irregularly spotted with darker, and with about 
10 black vertical lines crossing the lateral line.] (Giin- 
UG iE as SS SE es Bs SPY BST phe ai pa ..--ACHIRUS, 105. 
ce. Dorsal rays 53 to 57; anal rays 40 to 42; lat.1.75 to 80; depth 12 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. 
iVertobras 6 -- 20 26 sawn eee eee ee oe INSCRIPTUS, 106. 
bb. Parineal of right side only present. 
d. Dorsal rays 65 to 66; anal rays 48 to 51. 
e. Pectoral well dbealopell 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 33; 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 1? 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. 
f. 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, thee 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 14; color brown, the young spotted with 
whitish, the adult sometimes with darker; body with about 
8 narrow vertical cross-streaks of blackish. LINnATUS, 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, pl. 1, 
f. 1—Buenos Ayres), has been described from Santa Fé, Uruguay. We have not seen 
the description. 
