152 



engelske Kyster, i Regelen har været anseet som identisk 

 med 61. cynoglossus, bnr Dr. Day i forrige Aar paany 

 hævdet dens Artsberettigelse, efterat et nyt Individ var 

 kommet ham i Hænde i 1879. ligeledes fra de engelske 

 Kyster (Cornwall). I Proc. Zool. Soc. London 1879, p. 

 755. giver han en ny Beskrivelse og en correct Planene 

 (Pl. LXI) af denne efter hans Mening distinete Art; In- 

 dividets Længde var 9 eng. Tommer (omtr. 228"""). saa- 

 ledes noget nær af samme Størrelse) som det mindste af 

 Nordhavs-Expeditionens. 



Det fremgaar af Dr. Day's Beskrivelse af Pleuronec- 

 tés élongatus, at den væsentligste Ejendommelighed. sam- 

 menlignet med Glyptocephalus cynoglossus, ligger i Skjæl- 

 beklædningens Udstrækning, idet denne hos den førstnævnte 

 ikke strækker sig ud over Finnestraalerne (undtagen over 

 Caudalen), hvilket derimod er Tilfældet hos den sidste. 



Undersøges dette Forhold hos det mindste af Expe- 

 ditionens Individer, vil det sees. at ogsaa her strækker Skjæl- 

 beklædningen sig blot til Grunden af de verticale Finner, 

 og blot langs den nederste Del af enkelte Straaler ville de 

 første .Spor af Skjæl vise sig. Det ældste Exemplar, hvis 

 Totall. er 401""". har derimod Skjælbeklædning ud over Fin- 

 nerne, dog ingenlunde særdeles rigeligt. men hovedsagelig 

 blot langs Straalerne, og væsentlig paå disses nedre Del : et 

 Par Unger fra Norges Vestkyst, hvis Totallængde dog 

 ikke overstiger 05""". (de eneste Unger, som jeg har kunnet 

 uudersøge). ere endnu ganske skjælløse'. 



De øvrige Forskjelligheder mellem Pleuronectés élon- 

 gatus cg 6lyptocephdlus cynoglossus ere ganske uvæsentlige, 

 og kunne samtlige begrundes ved den forstmevntes yngre 

 Alderstrin 1 . 



Bemærkninger til Beskrivelsen. Ingen Forskjel 

 kunde opdages mellem Individet fra Finmarken, og ligestore 

 Individer fra Christianiafjorden. De 2 under Expeditionen 

 erholdte Individer havde følgende Maal: 



Lofoten. 



Tanafj orden. 



Totallængde .• . ■ 



Længde uden Caudal .... 



Hovedets Længde 



Legemets Højde 



Tændernes Antal var iios det største Individ paa 

 Øjeusiden oventil 10. nedentil 10. paa Blindsiden oventil 

 21. nedentil 19; hos det mindste paa Øjensiden oventil 10. 

 nedentil 11. paa Blindsiden oventil 21. nedentil 23. 



Straaleantallet var: 



a. D. 113; A. 97; P. .11; C. 23; V. (i. 



b. D. 109.; A. 90; P. 10; C. 20: V. 0. 



Udbredelse. Arten er ildbredt fra Canalen op langs 

 Europas Nordvestkyst, men var hidtil ikke fuuden længere 



1 |,B. V. 1 - er sandsyriligvjs ei) Trykfejl foT li. VII (hvis B. skal 

 være samme Tegn, som i Almhulelighed udtrykkea som M.B.). 



only have been taken — all from the English coasts — has 

 been generally regarded as identical with 61. cynoglossus.; 

 but in 1879 its supposed claim to specific distinction was 

 again asserted, by Dr. Day, who in that year had obtained , 

 a new specimen, and this one too from the English coast 

 (Cornwall). In Proc. Zool. Soc. London. 1879. p. 755. 

 that naturalist furnished a new description, with a good 

 drawing (PI. LXI). of this, in his opinion, distinct species. 

 The total length being 9 English inches (about 228"™). it 

 is of very nearly the same dimensions as the smallest of 

 the specimens collected on the Expedition. 



The chief distinctive feature in Pleuronectés élongatus, 

 as compared with Glyptocephalus cynoglossus, is derived, ac- 

 cording to Dr. Day. from the scaled integument, which in 

 the former does not extend over the fin-rays (saving those 

 of the caudal); in the latter, however, it does. 



But. on examining the smallest of the specimens ob- 

 tained on the Expedition, the scaled integument is found 

 to reach to the base of the vertical fins, a few rays only 

 exhibiting on their lower part traces of scales. 'In the 

 oldest example, total length 401 """. the scaling extends out 

 on the fins; it is not dense however, the scales occurring, 

 chiefly along the rays, and in particular on their lower 

 part. Two very young specimens (from the west coast of 

 Norway), with a total length of not more than 05 """, the 

 only young examples I have had an opportunity of examin- 

 ing, were still entirely scaleless. 



The other distinctive peculiarities supposed to dis- 

 tinguish PL élongatus from Gl. cynoglossus. are none of 

 them specific characters, but may all be referred to the 

 immaturity of the former. 1 



Descriptive Observations. — No difference could be 

 detected between the individual from Finmark and exam- 

 ]>les of equal size taken in the Christiania Fjord. The 

 specimens obtained on the Expedition, measured as follows: — 



Lpfoten. -Tana Fjord. 



Total Length 



Length exclusive of Caudal . . . 



Length of Head 



Depth of Body ...... 



Number of teeth on the coloured side in the largest indiv- 

 idual K» above and 10 below, on the blind side. 21 above and 19 

 below ; in the smallest individual on the coloured side 10 

 above and 11 below, on the blind side 21 above and 23 below. 



The fin-rays were as follows: — 

 ' a. D. 113; A. 97; P. 11; C. 23; V. 0. 



b. D. 109; A. 90; P. 10; ('. 26; V. 0. 



Distribution. — The range of <1. cynoglossus, which 

 extends from the British Channel along the north-western 



1 "B. V" is probably a misprint for B. VII. assuming the signi- 

 fication of B. to be that usually attached to M.B. 



