478 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



Genus LIMANDA Gottsehe 



The fauna of northern Japan (including Sakhalin Island) is rich in 

 species of this genus, 9 being known, 3 of these, from Sakhalin Island, 

 being here described as new. 



Key to the species of Limanda found in Japan and Sakhalin Island. 



a 1 . Teeth conical, in an irregular series more or less extended on eyed side of jaws. 

 b 1 . Limanda. — Snout not produced; no yellow streaks on blind side. 

 c 1 . Interorbital moderate, horizontal, scaly. 

 d 1 . Scales ctenoid, each with about 10 spines; lower jaw not projecting; ridges 

 of head not prominent. 

 e 1 . Depth, 0.44 to 0.55; teeth in an even row; upper jaw of eyed side 



arched aspera. 



e 2 . Depth, 0.39 to 0.46; teeth more separated and uneven; upper jaw of 



eyed side nearly straight sakhalinensis. 



d 2 . Scales ctenoid, each with a single spine; lower jaw projecting; ridges of 



head prominent asprella. 



c 2 . Interorbital narrow, sharp and naked; depth, 0.415 to 0.47 horigarei. 



b 2 . Myzopsetta Gill. — Snout produced; yellow streaks along bases of vertical fins 

 on blind side. 



g 1 . Scales about 70, cycloid on blind side iiidorum. 



g 2 . Scales about 90, ctenoid on blind side proboscidea. 



a 2 . Limandella. — Teeth broad, truncate, close-set, confined chiefly to the blind side 

 of each jaw; mouth very unsymmetrical. 



h 1 . Dorsal rays, 61 to 63; eye, 5.7 to 6.9 in head schrenki. 



h 2 . Dorsal rays, 65 to 75; eye, 4 to 5.5 in head. 



i 1 . Snout slender; interorbital narrow, naked in front angustirostris. 



i 2 . Snout blunt; interorbital wide, entirely scaled yohohamae. 



LIMANDA ASPERA (Pallas). 



Pleuronectes asper Pallas, Zoogr. Rosso- Asiat., vol. 3, 1811, p. 425. 



Limanda aspera Jordan and Stakes, Proc. U. S. Nat. Mus., vol. 31, 1906, p. 204. 



Numerous specimens from Petropavlovsk, Kamchatka, collected 

 on June 18-19, 1906, by the Fisheries steamer Albatross. 



Description of a male, 132 mm. long, from Petropavloysk, Kam- 

 chatka. 



Length of head, 0.245 of total length without caudal; depth, 0.45; 

 dorsal, 77; anal, 57; pores in the lateral line, 83. 



Head thick and rounded; elevation above the eye slight; ventral 

 outline nearly straight, the posterior end of mandible not prominent; 

 greatest width of head, 0.09; eyes small, nearly round, equal, and 

 on nearly the same vertical, the upper inserted high, its longitudinal 

 diameter, 0.05; eyes separated by a moderate, flat interorbital, its 

 entire width, 0.02; head without spines or tubercles, the ridge 

 posterior to eyes little developed, its surface slightly rough; nostrils 

 of the blind side nearly on ridge of snout, those of eyed side in the 

 same horizontal line in front of interorbital; edges of all nostrils 

 entire; both nostrils tubular, the posterior tube small with puckered 



