242 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [18] 
Genus VIII.—HIPPOGLOSSIiNA. 
Hippoglossina Steindachner, Ichth. Beitriige, v, 13, 1876 (macrops), 
Typr: Hippoglossina macrops Steindachner. 
This genus is intermediate between Hippoglossoides and Paralichthys, 
agreeing with the former in the insertion of the dorsal and in genera) 
appearance, and with the latter in the direction of the lateral line. Two 
species, the one from Japan, the other from Patagonia, have been lately 
referred to Hippoglossina. A fourth species, apparently still unde- 
scribed, is in the museum at Cambridge, from Japan. Some of these 
species are dextral, and perhaps all of them are normally so, or perhaps, 
as in the case of Xystreurys liolepis, all are indifferently dextral or sin- 
istral. 
ANALYSIS OF AMERICAN SPECIES OF HIPPOGLOSSINA. 
a. [Eye very large, 3} in head; body elliptical ; dorsal beginning over middle of eye ; 
pectoral of left side half head, much longer than maxillary, which is 27 in head and 
reaches middle of eye ; interorbital space a narrow ridge; teeth very small, sharp, 
uniserial ; scales of left side all strongly ctenoid, those of blind side ciliated only 
on posterior third of body ; head 23; depth 24 to 24, D. 66 or 67; A. 52; Lat. 1. 75 
to 80; no anal spine. Color, brownish, with obscure darker blotches; body sinis- 
tral (in the only specimen known) ] (Steindachner)..----..----------- MACROPS, 9. 
aa. [Eye small, 44 or more times in head; upper eye slightly before lower; snout 4} in 
head; interorbital space flat, with minute scales, half vertical diameter of eye; 
dorsal beginning above eye, of moderate height; mouth wide, maxillary extend- 
ing beyond middle of orbit; lateral line with a semicircular curve ; pectoral 2 in 
head; ventrals well developed, symmetrical. Grayish, minutely mottled with 
brown. Head 34; depth, 24; D. 72; A. 56.] (Giinther) ...--.-....-.. MIcRopPs, 10. 
9. HIPPOGLOSSINA MACROPS. 
Hippoglossina macrops Steindachner, Ichth. Beitr., v, 13, pl. iii, 1876 (Mazatlan). 
Habitat.—Pacific coast of Mexico, Mazatlan. 
We know this species from the description and excellent figure pub- 
lished by Dr. Steindachner. 
10. HIPPOGLOSSINA MICROPS. 
Hippoglossina microps Giinther, Voyage, H. M. 8. Alert. Jan. 4, 1881 (Patagonia). 
Habitat.—West coast of Patagonia. 
This specimen is known only from Giinther’s short description of a 
specimen four inches in length. 
Genus IX.—XYSTREURYS. 
Xystreurys Jordan & Gilbert, Proc. U. 8. Nat. Mus., 1880, 34 (liolepis). 
Type: Xystreurys liolepis Jordan & Gilbert. 
This genus is very close to Hippoglossina, differing chiefly in the sub- 
sessile caudal fin and the smooth seales. In its peculiar gill-rakers it 
agrees with those of a Japanese species of Hippoglossina examined by 
us. The typical species, like some other Pacific coast flounders, is al- 
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