lA'CODIX.E. 



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L. flagc/licmida 12,7 -14,2 ■■ „. But for tlie rest, there are apparent differences. The head in 

 L. flagcllu-aiida (fig. 31) is much broader than in L. murcena (fig. 17). In L. munrna the undeijaw, 

 seen from below, forms a tolerably steep arch, and its end reaches almost as far 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. 33), so that the mouth always 

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

 than in L. murcena, in which the\- look more out to the side. Teeth are found in botli species on 

 the jaws, palatines and vomer, but the>- are relatively long in L. iimrceiia. The number of branchiostegal 

 rays is 6 in L. nmrcena, o\\\\ 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. flagellicatLda against 7 in L. iuura:na (cf. fig. 32 and iS). 



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

 L. mnnvna, 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 18,8—20,6%. As I could not count the 

 ravs in the dorsal and anal fins of L. murcena with certaint\-, I am unable to sav if any distino-uishino- 



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character can be obtained therefrom; according to Collett the numbers (Z. w/wro'Wrt sens, strict: D. 118, 

 A. 100'); L. flagellicauda: D. loi — 108, A. 97 — 103) would indicate not. On the other hand, L. murcena 

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

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

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



The scales are evidentlx- laid down earlier in L. murcena 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 181 mm. long) are similarly covered; only the 

 middle of the belly (in front of the anus) is naked. L. flagellicauda shows some irregularit\- 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, 200 mm. long, is much more richly 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 co\-ering has a similar dis- 

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

 respectively 184 and 170 mm. are perfecth- naked. These specimens all come from one and the same 

 place (Ingolf St. 104). The remaining specimens (no— 188 mm. long) are either quite naked or .show 

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

 stage as the Ingolf s 204 mm. specimen, whereas the second, 198 mm. long, is much more richly covered 

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

 itself being provided with scales ^j. — Altogether, one may say, that the scales are laid down earlier in 



M In a specimen obtained later (from the Michael Sars ) 1 have found: D. 126, A. 104. 



-) In one of 3 specimens 1 have seen later (-Michael Sars» 1902), the scales also extended relatively far forward, 

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

 specimen was 203 mm. 



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