LYCODIN^. 



Franz Joseph's Fjord, 760 meters, whilst the Kolthoff Expedition of 1900 took 4 specimens at various 

 places in Franz Joseph's Fjord, 200—300 meters. The specimen of the North-Atlantic Expedition was 

 taken on the north coast of Spitzbergen, where the depth was 260 fathoms and bottom-tempera- 

 ture of + 1,1° C. The Dijmphna Expedition took the above-mentioned, but 87 mm. long, specimen in 

 the Kara Sea at 92 fathoms depth. The 2 specimens of the Ingolf Expedition were caught south 

 from Jan Mayen, where the depth was 371 fathoms and the bottom-temperature — 0^4 C. Lasth-, 

 the (.Michael Sars: in 1902 took a specimen in the cold area off tlie west coast of Norway, 

 at 62° 58' N.L. 1° 56' E.L., 600 fathouLS. 



Comparison between Ly codes scnu'nudits a n d L. reticulatus. 



As it has often been doubted that these names represent two different species, it ma>' be of use to 

 go over the most important differences between them, so far as the>' are limited in this treatise. 



The form of the body is more slender in L. seinjnudiis than in L. reticiilatus, so that the 

 height over the anus is g — io,6"„ of the total length in the former against 11,3 — 14,2 ° ,_, in the latter. 



The head is relatively larger in L. semimidus than in L. reticulatus; in the first-named nameh-, 

 the length in the males is 27 — 30° ;„ in the females 25— 28^/0 of the total length, whereas in the latter 

 the numbers are respectively 25,1 — 26,5 "o and 22,4 — 24,4 "o- The form also is somewhat different: 

 seen from the side, the head in /.. seminudns is more pointed forward, which arises from the snout 

 being much compressed in this species by comparison with L. reticiilatus ; the flat crown and tlie 

 almost vertical cheeks in L. semimidus are also in contrast to the convex cheeks and the somewhat 

 arched crown of L. reticulatus. Ne.xt, T.. seminudus has larger eyes, their longitudinal diameter being 

 5,3—3^/0 of the total length, whilst the same proportion sinks with age from 4 — 2,7 7o of the total 

 length in Z. reticulatus. The lips in L. seminudus are less flesh\- than in L. reticulatus. and the 

 double fold of skin hanging down from the chin in the latter (see fig. 10 in text) is very little developed 

 in L. semimidus (see fig. 12 in text). Fiirther, the bones of the mouth in L. semimidus have a greater 

 equipment of teeth than those of L. reticulatus : thus in [..reticulatus, I have counted 9 — 14 teeth in 

 a row on the intermaxillary, 8 — 15 in a row on the mandible, 9 — 13 on the palatine; in L. seminudus 

 on the other hand, 17 24 teeth in a row on the intermaxillar>', 17—26 on the mandible, 16 — 24 on 

 the palatine. Lastly may be mentioned, that the free flap of the gill-cover is relatively long in L. 

 semimidus., and that in this species the distance between the gill-openings across the belly is much 

 less than in L. retic7tlatus (cf. fig. 12 with fig. 10 in text). 



A ver\- evident difference is shown in the size of the pectorals, as their length in L. reticjtlatus 

 is 13 — 14,2 °„ of the total length, but onh- 9,6 — 11,8",, in L. seminudus. 



The scal\- covering has on the whole a greater extension in L. reticjtlatus than in L. 

 semimidus, so far as we yet know. In all the specimens of L. reticulatus to hand, whose lengths lie 

 between 225 — 380 mm., not only the tail, but also most of the tnnik is covered with scales, as these 

 reach forward to a point which lies under, or indeed somewhat in front of, the anterior end of the 

 dorsal fin. In a single specimen of L. seminudus, that of 365 nnn. namel}-, the scab" covering extends 

 forward to a point at the end of the flattened-out pectoral fin, and in all the remaining (17) specimens 



