LYCODIN.-E. ,S- 



L. flagellicatida 12,7 14,2",,. But for the vest, there are apparent differences. The head in 

 L. flagellicauda (fig. 31) is much broader than in /.. murcena (fig. 17). In L. murcena the underjaw, 

 seen from below, forms a tolerably steep arch, and its end reaches almost as Ear forward as the upper 

 jaw (fig. 19); in L. flagellicauda on the other hand, the under jaw forms a flat arch, and its an- 

 terior end lies a good way behind the point of the upper jaw (fig. $$), so that the mouth always 

 stands open . As a result of the breadth of the head, the eyes in L. flagellicauda are more upturned 

 than in L. murama^ in which they look more out to the side. Teeth are found in both species on 

 the jaws, palatines and vomer, but they are relatively long in L. murcena. The number of branchiostegal 

 rays is 6 in L. mur&na, only 5 in L. flagellicauda. The lateral line's deep, cup-shaped grooves along 

 the upper and lower jaws, reminding one of the suckers of the octopus, adorn the head of L. flagelli- 

 cauda in a characteristic manner; also, the number in the row on the upper jaw is a little different. 

 being 8 in L. flagellicauda against 7 in L. murczna (cf. fig. 32 and r.8). 



The dorsal fin begins, as Collett has also remarked, a little further forward relatively in 

 /.. murcena, as its distance from the snout in this species is 17,6- 18,2 % of the total length, whilst 

 its distance in 12 specimens of L. flagellicauda amounts to r8,8 20,6",,. As I could not count the 

 rays in the dorsal and anal fins of L. murama with certainty, I am unable to say if any distinguishing 

 character can be obtained therefrom; according to Collett the numbers (L. murama sens, strict. : I). 11N, 

 A. 100 ' |; L. flagellicauda: D. 101 — 10S, A. 97 — 103) would indicate not. On the other hand, /.. murama 

 has certainly a fewer number of rays throughout in the pectorals, viz. 13 — 15; in 12 specimens ( .t 

 L. flagellicauda I have counted 15 — 17 rays, and Collett gives for his two large specimens likewise 

 15 — 17 rays, only a quite small specimen appears to have 13 — 14. 



The scales are evidently laid down earlier in I., muraua than in L. flagellicauda. The 

 smallest specimen present, 140 mm. long, of L. murcena s. str. is already covered with scales on the 

 tail and the trunk, and the larger specimens (145 and 1S1 mm. long) are similarly covered; only the 

 middle of the belly (in front of the anus) is naked. L. flagellicauda shows some irregularity with 

 regard to the time of appearance of the scales. Of the specimens from the Ingolf Expedition, the 

 largest, whose total length is 204 mm., shows but quite solitary scales on the posterior portion of the 

 tail. The next largest, 2<«> mm. long, is much more richlv provided with scales; it has the posterior 

 portion of the tail densely covered, but further forward on the tail the scales are more spread out and 

 none are to be seen on the trunk. In a 183 mm. long specimen, the scaly covering has .1 similai dis- 

 tribution as in the foregoing, but the scales are on the whole less close. Lastly, two •specimens of 

 respectively ib'4 and 170 mm. are perfectly naked. These specimens all come from one and the same 

 place (Ingolf St. 104). The remaining specimens (no— 18X mm. long) are either quite naked or show 

 only weak traces of scales. Of Collett's two large specimens, the one (217 111111. long) was at the same 

 stage as the Ingolfs 204 mm. specimen, whereas the second, 19S mm. long, is much more richly covered 

 with scales than any other specimen of this species as yet known, not only the tail but also the trunk 

 itself being provided with scales 2 ). — Altogether, one max saw that the scales are laid down earlier in 



■i In a specimen obtained later (from the Michael Sars | I have found: D. 126, V 104. 



1 In one of 3 specimens I have seen later 1 Michael Sars [902), the scales also extended relatively fai forward, 

 namely to the vertical line through the anterior end oi the dorsal fin, though they were much scattered; the length of this 

 specimen was 203 mm. 



