84 



LYCODIN.B. 



in the relation of about i : 2 (sometimes 2 : 3), and tliereafter the tail becomes narrower towards 

 the root of the candal fiu. L. flagellicaiida on the other hand has a much broader body: the 

 trunk is round; at the beginning of the anal fin the body is almost as thick as high, and the tail 

 has almost the same thickness relatively in the greatest part of its length, onl\- near the end does it 

 become compressed. Seen from above, L. murcena (fig. 16) with its compressed tail looks therefore 

 rather different by the side of the round-tailed L. flagellicanda (fig. 30). The difference is most appa- 

 rent indeed, if the animals are viewed from the side: in L. uuiycena (fig. 15) the tail displays a 

 gradual decrease in height, whereas in L. flagellicaiida (fig. 29) the tail becomes directly 

 remarkably low, as the lower edge immediately behind the anus rises upwards with a rapid slope; 

 by its specialh- slender, whip-like tail, L. flagellicauda stands on the whole quite isolated amongst the 



Fig. 15 — 1 5. Lycenchelys muyana, seen from the side and from above. X i. 

 The scales are omitted. The oval ring over the upper figure shows the form of a cross-section at the place indicated. — The 

 figures are drawn from Collett's type-specimen of Lycodes tnurcena from the Norwegian North-Atlantic Expedition of 1S77. 



Lycodes known to me. — The distance between the snout and the anus in L.murcEjia is 27,6 — 30,4% 

 of the total length, in specimens of L. flagellicaiida (of similar size| 24,2 — 28 "/o, i. e. on the whole is 

 greater in L. murcena. 



Fig. 17 — 19. Head of Lycenchelys murcrna, seen from above, the side and below. X ^ i. 

 Drawn from Collett's tvpe-specimen from the Norwegian North-Atlantic Expedition of 1S77. 



The head has about the same relative length in the two species; in the specimens at hand of 

 L. murcena the length of the head namely is 12,9 — 13,3 % of the total length, in adult specimens of 



