152 



Lofoten. 



Totallæugde . . . 

 Lisugde udeu Caudal 

 Hovedets Længde- 

 Legemets Højde . 



212""' 



170 - 



37 - 



52 - 



Taiiaijordeii. 



401 "'" 



325 - 



69 -• 

 141 - ' 



Tæuderues Autal var hos det største Individ paa 

 Øjensiden oventil 10. nedentil 10. paa Blindsideu oventil 

 21. nedentil 19: hos det niiudste paa Øjensiden oventil 10. 

 nedentil 11. paa Bliudsiden oventil 21. nedentil 23. 



Straaleantallet var: 



a. D. 113; A. 97: P. 11: C. 23: Y. G. 



b. D. 109; A. 90: P. lO: C. 26: Y. 6. 



Udbredelse. Arten er udhredt fra Canalen op laugs 

 Europ'as Nordvestkyst, men var hidtil ikke lunden længere 



engelske Kyster, i Regelen har været anseet som identisk 

 med GI. cynoglosms: har Dr. Day i forrige Aar paany 

 hævdet dens Artsberettigelse. efterat et nyt Individ var" 

 kommet ham i Ha'nde i 1879. ligeledes fra de engelske 

 Kj-ster (Cornwall). I Proc. Zool. Soc. London 1879, p. 

 755. giver han en ny Beskrivelse og en correct Planche 

 (Pl. LXI) af • denne efter ■ hans Mening distincte Ai-t ; In- 

 dividets Læugde var 9 eng. Tommer (omtr. 228'"^"), saa- 

 ledes uoget nær af samine Størrelse, som det mindste af 

 Nordhavs-Expeditionens. • 



Det fremgaar af Dr. Day's- Beski'ivelse af Pleuronec- ' 

 tes elongatus, at- den væsentligste Ejendommelighed, sam- 

 menlignet med GlyptocepliaJus ci/noghssits, Ugger i Skjæl- 

 beklædningens Udstrækning. idet denne hos den førstnæ^^Ite 

 ikke strækker sig ud over Finnestraalerne (undtagen over 

 Caudalen), hvilket derimod er Tilfældet hos den sidste. 



Fndersøges dette Forhold hos det mindste af Expe- 

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

 heklædningeii sig blot tri Grundeu af de verticale Finner, 

 og bh)t 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 Tiovedsagelig 

 blot langs Straalerne. og væsentlig paa disses necfre Del ; et 

 Par lauger fra Norges Yestkyst. hvis Totallængde dog 

 ikke overstiger 65"'"'. (de eneste Unger, som jeg har kunnet 

 uudersøge). ere endnu ganske skjællose. 



l5e øvrige ForskjelUghéder mellem Pleuronedes ehn- 

 gaUis og Olypfocéphahis ajnoghssus ere ganske uvæsenthge, 

 og kunne samtlige begrimdes ved den førstnevntes yngre 

 Alderstrin'. 



Bemærkninger til Beskrivelsen. Ingen Forskjel 

 kunde opdages melJem Individet fra Finmarken, og ligestore 

 Individer fra Christianiatjordeu. De 2 under Expeditionen 

 erholdte Individer havde følgende Maal: 



' ,.B. V." er sandsynliovis en Trykfejl for B. VII ibvis B. skal 

 være samme Tegn, som i Almindelighetl udtrvkkes som M.B. i. 



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

 been generally regarded as identical with Gl. 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 Pleihronedes elongatus, 

 as compared with GJyx'tocepliaJus cynoglossus, is derived, ac- 

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

 the former does Hot 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 foimd 

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

 exhibiting on their lower part traces of scales. In the 

 oldest example, total length 401 "'"', the scahng 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 OS"'™, the 

 only young examples I have had an opportunity of examin- 

 ing, were still entirely scaleless. 



The other distinctive peculiarities supposed to dis- 

 tinguish PI. elongatus from GI. cynoglossus, are none of 

 them specific characters, but may all be referred to the 

 immaturity of the former.' 



Descriptive Observations, r— No difference could be 

 detected between the individual from Finmark and exam- 

 ples of equal size taken in the Christiania Fjord. The 

 specimens .obtained on the Expedition, measured as follows: — 



a. \ h. 



Lofoten. | 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 10 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. 6. 



h. 1). 109: A. 90; P. 10: C. 2^S\ V. 6. 



Distribution. — The range of G. cynoglossus. which 

 extends from the British Channel along the north-western. 



' "B. V" is pi-obably a 'misprint for _B. "\'II, assuming the signi- 

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



