FLOUNDERS FROM JAPAN. 



373 



In two instances however, a certain qualification must be made. In a 

 small specimen of platessoides, 63 mm. long from tip of snout to base 

 of caudal, 1 the margin of the dorsal fin is slightly concave posteriorly, 

 but it is convex in the adult. The lateral line in the Pacific species 

 usually forms a well-marked curve anteriorly," but in H. elassodon 

 is only a little more curved than in platessoides. Other differences 

 further serve to distinguish the two groups : the Pacific species have 

 stronger premaxillary teeth than those from the Atlantic, and they 

 lack the dark spots, so characteristic of their Atlantic representatives. 



The species of the two oceans should apparently be separated as 

 distinct groups, which arc provisionally regarded as subgenera. The 

 Atlantic forms retain the name Hippoglossoides Gottsche, 1835, while 

 Cynopsctta is available for the Pacific species. This name was proposed 

 by Schmidt (in 1904) as a genus for C. dubia to distinguish that 

 species from elassodon, primarily on account of the stronger dentition. 

 This character, however, is only of specific value, as Schmidt has since 

 recognized. 



C— List of the Subgenera and Species of Hippoglossoides. 



Subgenus Hippoglossoides. 



H. platessoides (Fabricius). 3 



H. limandoidcs (Bloch). 

 Subgenus Cynopsctta. 



H. elassodon Jordan and Gilbert. 4 



1) From long, io E., lat. 72°20 / N. 



2) This character is quite variable in //. dulrius. 



3) The form from Greenland and the east coast of North America is probably distinct 

 from the European species //. limandoides (see Smitt, Hist. Scandin. Fishes, I, 1893, p. 421, 

 pi. 17, lig. 3). 



Both of the specimens in the collections of Stanford University have 11 pectoral rays, 

 corresponding with Smitt's figures f jr platessoides. One of these is from Massachusetts ; the 

 other, from long. 10° E., lat. 79° 2o' N. 



4) Dorsal, 75 and 80 ; anal, 59 and 60 ; in two specimens from AlBatross station 3642, 

 Avatcha Bay, Kamchatka. 



