242 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [18] 



Genus VI II.— HIPPOGLOSSiXA. 



Hippoglossina Steindachner, Ichth. Beitrage, v, 13, 1876 {macrops). 



Type : Hippoglossina macrops Steindachner. 



This genus is intermediate between Hippoglossoides and Paralichthy^ 

 agreeing with the former in the insertion of ihe dorsal and in generai 

 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 bead, much longer than maxillary, which is 2J in head and 

 reaches middle of eye ; interorbital space a narrow ridge ; teeth very small, sharp, 

 imiserial ; scales of left side all strongly ctenoid, those of blind side ciliated only 

 on posterior third of body ; head 2\ ; depth 2£ to 2£, 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, 4i or more times in head ; upper eye slightly before lower; snout 4^ in 

 bead; 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 ; veutrals well developed, symmetrical. Grayish, minutely mottled with 

 brown. Head 3£; depth, 2J; D. 72; A. 56.] (GUnther) Microps, 10. 



9. HIPPOGLOSSINA MACROPS. 



Hippoglossina macrops Steindachner, Ichth. Beitr., v, 13, pi. iii, 1876 (Mazatlau). 



Habitat. — Pacific coast of Mexico, Mazatlau. 



We know this species from the description and excellent figure pub- 

 lished by Dr. Steindachner. 



10. HIPPOGLOSSINA MICROPS. 

 Hippoglossina microps GUnther, Voyage, H. M. S. Alert. Jan. 4, 1881 (Patagonia). 



Habitat. — West coast of Patagonia. 



This specimen is known only from Guntner's short description of a 

 specimen four inches in length. 



Genus IX.— XYSTREURYS. 



Xystreurys Jordan & Gilbert, Proc. U. S. Nat. Mus., 1880, 34 (liolepis). 



Type : Xystreurys liolepis Jordan & Gilbert. 



This genus is very close to Hippoglossina, differing chiefly in the sub- 

 sessile caudal flu and the smooth scales. 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 aj- 



