146 



bergen til Undersøgelse i 1864, troede indtil videre at burde 

 opføre den som en tra PJ. limandaides distinct Art (Ofv. 

 Kgl. Vet. Akad. Forb. 1864. p. 525). medens Giintber 

 (1862) i sin Cat. Fisb. Brit. Mus. vol. 4, p. 4U5 (i Noten) 

 kan sees at bave været tilbøjelig til at betragte dem begge 

 som identiske. 



Dé C'liaracteror. bvorved denne ostlig-arctiske Art 

 angives at kunne boldes ud fra den europæiske Pleio'om'c- 

 fes limandoideS) ere væsentlig et større Antal Straaler i tie 

 verticale Finner, samt en relativt storre Legemsbojde. Jeg 

 bar tdlen'de i 1878 i den iorelobige Bei'etuing om Kord- 

 bavs-Expeditionens Fiske søgt at paavise, at disse Charac- 

 terer ikke ere af nogeu algjørende Betj'dning, og- fremsat 

 den Formodning, at begge disse Arter vare identiske. 



Efterat jeg i det sidstforløbne Aar. ved Dr. Liitken's 

 Yelvillie, bar bavt Lejliglied til at undersoge den Riekke 

 typiske Exemplarer af Fabricii Pleuronedes pJafessoides, 

 alle fra Grønland, der opbevares 'i Musæet i Kjøbeubavn, 

 bar jeg fundet denne Forinodning bekræftet. Eu directs 

 Sammenligning mellem de uævnte Typ-Exemplarer og Nord- 

 havs-Expeditiouens Individer fra Havet sondenfor Spitsber- 

 gen udviste, at de vare fuldstændig overensstemmende ind- 

 byrdes. ligesom disse spitsbergenske Individer i ingen væ- 

 sentlig Henseende ere Ibrskjellige fra ligestore Individer 

 fra Christianiafjorden. som nedenfor skal udvikles. 



Af Slægten Hippoglossoides, opstillet af Gottscbe i 

 1835 for ^loch's PJeiironedes lima»doides, tindes der idet- 

 bele blot 3 bekjendte Arter, nemlig foruden den nord- 

 atlantiske H. platessoides. Fabr., tillige 2- Arter ira de 

 nordlige Dele af det stille Hav (H. jordani, Lock. 1879, 

 og H.exilis, Jord. & Gilb. 1880). 



Betnærkninger til Beskrivelsen. De under Expe- 

 ditionen erboldte Individer bavde følgende Maal og Straale- 

 antal : 



Stat. 326. (Søudenfor Spitsbergen). 



bergen, saw tit to regard it preliminarily as distinct from 

 Pl. limandoides (Ofv. Kgl. Vet. Akad. Forh. 1864. p. 525); 

 and that Giintber (1862), in bis Cat. Fisb. Brit. Mus. vol. 

 4. p. 405 (as appears from the note), was inclined to 

 regard them as identical. 



Tlie characters which, as a rule, are said to distin- 

 guisli this East Arctic species from the European Phniro- 

 nedes limandoides, consist cliietly in the vertical fins having 

 a greater number of rays, and in the deptli of the body 

 being relatively greater. In my preliminary Report (1878) 

 on the fishes from the North Atlantic Expedition, I 

 sought to show that these characters were of no essential 

 importance, and ventured to suggest the identity of the 

 two species. . 



Since then, this view has received additional support. 

 Dr. Liitken having kindly atforded me opportunity of ex- 

 amining, last year, the specimens of Fabricius's typical 

 Pletironedes plafessoides' (all from Greenland) .preserved in 

 the Zoological Museum at Copenhagen. On instituting a 

 direct comparison between these typical s})ecimens and the 

 individuals collected on the North Atlantic Expedition south 

 of Spitzbergen. they were found to exhibit the closest 

 agreement; nor did the Spitzbergen individuals dift'er ma- 

 terially from examples of equal size taken in the Christiania 

 Fjord, as will afterwards be shown. 



In the genus Hippoglossoides, established by Gottscbe, 

 1835. for Blocli's Pleuronedes limandoides, are comprised 

 of known sjjecies only 3. viz: — the North Atlantic spe- 

 cies H. plaiessoides, Fabr.. and 2 species occurring in tlie 

 northern tracts pf tlie Pacific (H. jordani, Lock. 1 879. and 

 H. exAis, Jord. & Gilb. 1880). 



Descriptive Observations. — Measurements of. and 

 number of fin-rays in, the specimens obtained on the Ex- 

 pedition: — 



Station 326 (South of Spitzbergen). 



