I.VCdDIX.v:. 



H5 



L. flagcllicaiida 12,7 — 14,2 '\,. ISut for tlie rest, there are apparent differences. Tlie head in 

 L. flagellicauda (fi.i;-. 311 is niucli liroader than in L. iniiycEva (fig. 17). In L. iniinv)ia the underjaw, 

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

 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 wa>- behind the point of the npper jaw (fig. 33), 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. murcEJia, in which they look, more out to tlie side. Teeth are found in both species on 

 the jaws, palatines and \omer, but the}' are relatively long in J..mni'iViia. The number of branchiostegal 

 ra\s is 6 in L. murcena, onl\- 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 [..flagelli- 

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

 being S in L. flagellicauda against 7 in L. jnurcetia (cf. fig. 32 and 18). 



The dorsal fin begins, as Collett has also remai-ked, a little further forward relativeh- in 

 A. inurcciia. as its distance from the snout in tliis species is 17,6 — 18,2 °o 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 

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

 character can be obtained therefrom; according to Collett the numbers (Z. ;//«r^«rt sen.s. strict. : D. 118, 

 A. icx)'); L. flagellicauda: D. loi— 108, A. 97 — 103I wt)uld indicate not. On the other hand, L. inurcena 

 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 ray.s, only a quite small specimen appears to have 13—14. 



The scales are evidently laid down earlier in L. murceiia than in L. flagellicauda. The 

 smallest specimen present, 140 mm. long, of L. murcena s. str. is alread\- co\-ered 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. /.. flagellicauda shows some irregularit>- with 

 regard to the time of appearance of the scales. Of the specimens from the Ingolf E-xpedition, the 

 largest, whose total length is 204 mm., shows but quite solitar>- 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 tlie tail denseh' 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 a similar dis- 

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

 respectively 184 and 170 mm. are perfectly 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 richlv coxered 

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

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



M 111 a spfciinen 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. 



