92 



Finnerne. Straaleantallet hos de 4 under Expeditio- 

 nen erholdte yngre Individer var følgende (Caudaleu ind- 

 befattet i Dorsalen og Analen): 



Hos de store Individer fra Finninrken lcd Straalean- 

 tallet sig kun hos de 2 med nogenlunde 8ikkerhed tælle, 

 og dette viste sig at være følgende: 



At Straaleantallet hos disse fuldt udvoxede Individer 

 er større, end hos de yngre, maa foi'klares paa den Maade, 

 at der har vedblevet at afsætte 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 103, elli^r hos særdeles gamle Individer lige 

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

 regnes. Dorsalstraalerne ere alle kløvede indtil (Jrundeii, 

 og fi-a Midten af tint 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 fetltholdig Hud. der meget ligner den. der findes 

 hos Anarrhkhas- Axtexne. 



Analen tiltager, ligesom Dorsalen, i Strnaleantal med 

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

 til 102 Straaler. Caudalens nedre Halvdel (5 Straaler) 

 iberegnet. Den er iøvrigt bygget ligesom Dorsalen, og en 

 l)obbeltklo\niing linder ogsaa her Sted hos de længste 

 Straaler. 



Caudaleu har sandsynligvis hos alle Lycoder den samme 

 Bygning, og er dannet af et øvre Straaleknippe, bestaaende 

 af 6, et nedre af .0- 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""") 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 aUe yngre ere de 6 

 nederste Straaler noget forlængede, saaledes at de rage 

 kjendeligt frem forbi de mellemste Straaler; derved bliver 

 Finnens Rand tydeligt indskaaret. Hos de ældi-e Individer 

 ere derimod de nedre Straaler gradvis forkortede, og et- 



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

 in the 4 young individuals obtained on the Expedition was 

 as follows: — 



Dorsal (-[- Va caudal) 

 Anal (+ 1/2 caudal) 

 Pectorals 



103 

 88 

 20—21 



103 



91 



22—23 



c. 



103 



92 



22—23 



d. 



102 



90 



21—22 



In 2 only of the large individualsfrom Finmark could 

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

 curacy; the foi'mula was as follows: — 



A. 



C. 



Dorsal (-{- V2 caudal) 

 Anal (+ Vi caiidal) 

 Pectorals 



118 i 113 



105 ' 97 



23—23 I 23—23 



The fact of the rays in these fuU-grown examples 

 having been more numerous than in the young individuals 

 may be explained by assuming vertebræ to have succes- 

 sively developed along with the rays throughout the whole 

 period of growth. 



The dorsal, commencing at a distance from the 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 ((i rays). The dorsal 

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

 articulated; moi'eover. 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 fi-om 20 to 23 rays, 

 and the number is not iufretiuently difi'erent . 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 fin 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 fin a notched appearance. In 

 more mature examples, the inferior rays gi-adually decrease 



