146 



bergen til Undersøgelse i 1 864', troede iiititil videre at burde 

 opfore den som en fra Pl. limamdoides distinct Art (OfV. 

 Kgl. Vet. Akad. F6rb. 1864. p. 525). medens Gunther 

 (1862) i sin Cat. Fish. Brit. Mus. vol. 4. p. 405 (iNoten) 

 kan sees at have været tilbøjelig til .at betragte dem begge 

 som identiske. 



De Oharacterer, hvorved denne østlig -arctiske Art 

 angives at kunne boldes ud fra den europæiske Plewonec- 

 tes limundoides, ere væsentlig et større Antal Straaler i de 

 verticale Finner, samt en relativt større Legemsbojde. Jeg 

 bar allerede i 1878 i den foréløbige Beretning om Nord- 

 bavs-Expeditionens Fiske søgt at paavise. at disse Oharac- 

 terer ikke ere af nogen afgjørende Betydning, og fremsat 

 den Formodning, at begge disse Arter vare identiske. 



Efterat jeg i det sidstforlobne Aar. ved Dr. Liitken*s 

 Velvillie, bar bavt Lejlighed til at undersoge den Række 

 typiske Exemplarer af Fabricii Pleuronedes plnlessoides, 

 alle fra Grønland, der opbevaresi Musæet i Kjøbenhavn, 

 bar jeg fundet denne Formodning bekræftet. En directe 

 Sammenligning mellem de nævnte Typ-Exemplarer og Nord- 

 havs-Expeditionens Individer fra Havet søndenfor Spitsber- 

 gen udviste, at de vart' fuldstændig overensstemmende ind- 

 byrdes. ligesom disse spitsbergenske Individer i ingen væ- 

 sentlig Henseende ere forskjellige fra ligestore Individer 

 fra Christianiafjorden. som nedenfor skal udvikles. 



Af Slægten Æppoglossoides, opstillet af Gottsche i 

 1835 for Blocb's Pleuronedes limundoid.es, lindes der idet- 

 hele blot 3 bekjendte Arter, nemlig foruden den nord- 

 atlantiske H. platessoides, Fabr., tillige 2 Arter frå de 

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

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



Bemærkninger til Beskrivelsen. Dé under Expe- 

 ditionen erholdte Individer havde følgende Maal og Stråale- 



antal : 



Stut. 326. (Søndenfor Spitsbergen). 



bergen, saw fit to regard it preliminarily as distinct from 

 Pl. limundoides (Ofv. Kgl. Yet. Akad. Forb. 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. 



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

 guish this East Arctic species from the European Pleuro- 

 nedes limundoides, consist chiefly in the vertical fins having 

 a greater number of rays, and in the depth 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 afforded me opportunity of ex- 

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

 FleUronedes platessoides (all from Greenland) preserved in 

 the Zoological Museum at Copenhagen. On instituting a 

 direct, comparison between these typical specimens 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 differ ma- 

 terially from examples of equal size taken in the Christiania 

 Fjord, as will afterwards be shown. 



In the genus Hippof/lossoides, established by Gottsche, 

 1835, for Blocb's Pleuronedes limandoides, are comprised 

 of known species only 3, viz: — the North Atlantic spe- 

 eies H. 'platessoides, Fabr.. and 2 species occurring in the 

 northern tracts of the Pacific (H. jordani, Lock. 1879, and 

 //. ecdliS; 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). 



