92 



Finnerne. Straaleantallet hos de 4 under Expeditio- 

 nen erholdte yngre Individer var følgende (Caudalen ind- 

 befattet i Dorsalen og Analen): 



Dorsalen (+ */« Caudal) 

 Analen (+ 1 j 2 Caudal ) 

 Pectoralerne 



u. 



103 



88 

 20—21 



103 



91 



22—23 



103 

 92 



d. 



102 

 90 



22—23 21—22 



Hos de store Individer fra Finmarken lod Straalean- 

 tallet sig kun hos de 2 med nogenlunde Sikkerhed tælle, 

 og dette viste sig at være følgende: 



Dorsalen (+ 1 /- 2 Caudal) 

 Analen (+ l / 2 Caudal) 

 Pectoralerne 



118 



102 



23—23 



0. 



113 



97 



23—23 



At Straaleantallet hos disse fuldt udvoxede Individer 

 er større, end hos de yngre, maa forklares paa den Maade, 

 at der har vedblevet at atsætte sig Hvirvler med tilhørende 

 Straaler under hele' Opvæxten. 



Dorsalen, som udspringer i en Afstand fra Nakken, 

 der er omtrent lig en halv Pectorallængde. indeholder saa- 

 ledes 102 til 1<)3, eller hos særdeles gamle Individer lige 

 til 118 Straaler. om den halve Caudal (6 Straaler) med- 

 regnes. Dorsalstraalerne ere alle kløvede indtil Grunden, 

 og fra Midten af rint articulerede ; hos de længste Straaler 

 (paa Midten af Halepartiet) er ligeledes hver Halvdel atter 

 kløvet. Den hele Finne er. ligesom Analen, indhyllet i en 

 tyk og fedtholdig Hud, der meget ligner den. der rindes 

 hos Anarrhichas-Arteme. 



Analen tiltager, ligesom Dorsalen, i Straaleantal med 

 Alderen, og har hos yngre 88 — 92, hos fuldt udvoxede ind- 

 til 102 Straaler. Caudalens nedre Halvdel (5 Straaler) 

 iberegnet. Den er iovrigt bygget ligesom Dorsalen, og en 

 Dobbeltkløvning rinder ogsaa her Sted hos de længste 

 Straaler. 



Caudalen har sandsynligvis hos alle Lycoder den samme 

 Bygning, og er dannet af et ovre Straaleknippe, bestaaende 

 af 6, et nedre af Straaler. alle korte, spinkle og særde- 

 les tætstaaende, saa at de kun med \ anskelighed lade sig 

 tælle. 



Pectoralerne tælle 20 til 23 Straaler, og Tallet er ofte 



ulige paa hver Side hos samme Individ. De ere forholds- 

 vis længst hos yngre Individer; hos den mindste foreliggende 

 Unge (hvis Totallængde er 81. mm ) indeholdes de 6.7 Gange 

 i Totallængden, hos et fuldt udvoxet omtrent 8,5 Gange i 

 denne.- 



Fremdeles undergaar denne Finne en Forandring i 

 sin Form under Opvæxten, hvortil jeg ikke har seet noget 

 tilsvarende hos de øvrige Arter. Hos alle yngre ere de (i 

 nederste Straaler noget forlængede, saaledes at de rage 

 kjendeligt frem forbi de mellemste Straaler; derved bliver 

 Finnens Band tydeligt indskaaret. Hos de ældre Individer 

 ere derimod de nedre Straaler gradvis forkortede, og et- 



Fins. — The number of rays, inclusive of caudal, 

 in the 4 young individuals obtained on the Expedition was 

 as follows: — 



Dorsal (-4- \/ 2 caudal) 

 Anal (+ r /g caudal) 

 Pectorals 



(I 



102 

 90 



21—22 



In 2 only of the large individuals from Finmark could 

 the number of fin-rays be determined with comparative ac- 

 curacy; the formula was as follows: — 



The fact of the rays in these full-grown examples 

 having been more numerous than in the young individuals 

 may lie explained by assuming vertebrae to have succes- 

 sively developed along with the rays throughout the whole 

 period of growth. 



The dorsal, commencing at a distance from trie nape 

 about equal to half the length of the pectorals, contains 

 from 102 to 103. or. in very old examples, as many as 118 

 rays, including half of the caudal (6 rays). The dorsal 

 rays are all cleft to the base, and from the middle finely 

 articulated; moreover, in the longest rays (middle of caudal 

 region) each half is cleft. As with the anal, the whole fin 

 is enveloped in a thick adipous skin, closely resembling that 

 observed in the genus Anarrhichas. 



As in the dorsal, the number of rays in the anal in- 

 creases with the growth, being in young examples 88 — 92, 

 and in adults reaching 102, inclusive of the lower half of 

 the caudal (5 rays). The structure of the anal is similar 

 to that of the dorsal; the longest rays of this fin, too, are 

 double-cleft. 



The structure of the caudal is probably the same in 

 all the Li/codes; there is an upper fascicle of rays, consisting 

 of 6, and a lower one, consisting of 5 rays, all short, slender, 

 and exceedingly close, which renders it a matter of no little 

 difficulty to count them. 



The pectorals are furnished with from 20 to 23 rays, 

 and the number is not infrequently different on each side 

 in the same individual. They are relatively longest in young 

 examples; in the smallest of the young specimens (total 

 length 81"""), their length is to the total length as 1 to 6.7 ; 

 in an adult, nearly as 1 to 8.5. 



This rin undergoes, too, a change in its form during 

 the period of growth, to which I have observed nothing 

 analogous in any of the other species. All young indivi- 

 duals have the 6 lowest rays somewhat elongated, causing 

 them to project perceptibly past the middle rays, which 

 gives to the margin of the tin a notched appearance. In 

 more mature examples, the inferior rays gradually decrease 



