[53 | FLOUNDERS AND SOLES. 277 
Genus XXIJ.—ETROPUS. 
Etropus Jordan & Gilbert, Proc. U. 8. Nat. Mus., 1881, 364. (Crossotus. ) 
TypPE: Htropus crossotus Jordan & Gilbert. 
This genus is very close to Citharichthys, from which it differs only 
in the very small size of the mouth, and in the correspondingly weak 
dentition. The three known species are similar in appearance to the 
species of Citharichthys, and they inhabit the same waters. Another 
‘genus extremely close to Htropus and Citharichthys is Thysanopsetta. 
The teeth in Thysanopsetta are, however, arranged in a band. 
ANALYSIS OF SPECIES OF ETROPUS. 
a. Body comparatively elongate, the head anteriorly acute; dorsal rays 913; anal 
rays73; scales in the lateral line 54 ; back less elevated than in other species ; head 
small, the profile forming an angle at the posterior part of upper eye, the snout 
being abruptly pointed ; eyeslarge, 4§ in head, the lower being before the upper ; 
interorbital space elevated, with two prominent ridges, thespace between them 
concave ; ridge above lower eye higher than upper and joining the latter behind 
upper eye, to form a sharp ridge; upper eye with some. vertical range; mouth 
_ very small, the maxillary 4 in head, not reaching front of pupil; teeth bluntish, 
close-set, in one row, chiefly on the blind side; scales and fins much as in ZL. 
crossotus ; the edge of the subopercle on thé blind side fringed with white cirri, . 
as inthe latter species; scales large, loose, little ciliate; gill-rakers very short 
and slender; gill membranes broadly united ; caudal fin rhombic, ratber pointed ; 
pectoral 14 in head; fin rays scaly; head 5 in length; depth 2}; color light 
olive-brown, with vague spots and darker markings; fins similarly marked. 
ECTENES, 60. 
aa. Body deeper, the head not acute in profile ; dorsal rays 76 to 85; anal 56 to 67; 
scales 38 to 48; teeth sharp, close-set, uniserial. 
b. Body somewhat elongate, pear-shaped, the depth not more than half the length, 
the body thinner and more compressed thanin £. crossotus; mouth very small, 
the maxillary 4} in head; eye 3 to 34 in head; interorbital space a narrow, sharp 
ridge; cirri on subopercle rather few and long; D. 77 to 73; A. 57 to 61; lat. 1. 
38 to 41. Head4inlength; depth2} to2. Vertebre 9+4+25—34. Color gray- 
ish, with a few irregular vague dark blotches, none of them larger than the eye ; 
‘fins speckled ; two dark spots at base of caudal..--...-.---- MicrostTomus, 61. 
bb. Body very deep, the depth rather more than half the length ; eye 33 in head; in- 
terorbital space a narrow, sharp ridge, divided anteriorly ; maxillary about.4 in 
head; head 44; depth 14to 2 (14 in Atlantic specimens). D. 76 to 85; A.56 to 
67; lat.1. 48 (42 to 45 in Atlantic specimens). Vertebre 9-+ 25—34; cirri on 
subopercle of blind side numerous, white; color light olive-brown, witb some 
darker blotches; vertical fins finely mottled and speckled with black and gray. 
CROSSOTUS, 62. 
60. ETROPUS ECTENES. 
Hiropus ectenes Jordan, sp. nov. . 
Habitat.—Pacifice coast of South America. ' 
The types of this species are two examples (11605, Mus. Comp. Zool.) 
collected at Callao, Peru, by Dr. Jones. There are also a large number 
of young examples in the collection (11145) obtained at Paraca Bay by 
the Hassler Expedition. 
