LYCODIN.-E. II 



Body moderatel}- elongated ( zoarciforin ), lieij^ht over the anus ca. 7 — 12'/2 times 

 ill the total length. Teeth on the in terinaxi 1 1 ar >• and mandible, vomer and palatines. 

 Underjaw without barbules. Scales small, co\ ering a greater or less part of the trunk 

 and tail, sometimes wanting. Lateral line \entral or niediola teral or both medio- 

 lateral and ventral. Rranchiostegal ra\-s 6. 



The characters which are of special importance for distingnishing between the numerons 

 .species of this genns have been mentioned in detail in the introduction (p. 3 — 7). A detailed diagnosis 

 is given under each species and I shall here endeavour (p. 11 — 12) to draw up a Kev for the deter- 

 mination of the North European and Greenland species — the man\- difficulties in the way of .separa- 

 ting such iiearh- allied species must be the excuse for the apparent sliortcomings. 



Tentative key for the determination of the European and Greenland species ' 1 (and varieties) of Lycodes. 



I. Vahlii-esuiarkii group: Lateral line ventral or both ventral and mediolateral. Distance between 

 the snout and the anus 36,5 — 45 (47) 7o of the total length. D. 94 — 118; A. 81 — 102. 



A. Lateral line single, ventral. 



a. Rays in the pectoral fins 23. (East coast of Xorth America; 516 — 1423 fathoms). 



L. atlanticus Jensen; p. 25. 



b. Rays in the pectoral fins 17 — 21. 



1. Colour (at all ages) uniform, without spots or bands. (Polar Depths from Spitzbergen to 

 Iceland and Fseroe Isles; (260?) 450 — 1455 fathoms). L.frigidus Coll.; p. 22. 



2. Body with dark cross-bands, in adults ring-shaped markings or more uniform; in the 

 anterior corner of the dorsal fin almost always one or more dark spots. (Kattegat, 

 Skager Rak, Norway, Iceland, southerly West-Greenland; 30 — 300 fathoms). 



L. vahlii Reiiih.; p. 13. 



B. Lateral line double, \-entral and mediolateral. 



a. Bod\- naked. (Polar Depths between Jan Mayeu and Iceland; loio fathoms). 



L. p/aiyrhiiius ]e\\SQ\\\ p. 51. 



b. Body with scales. 



a. Pyloric appendages absent. Rays in the pectoral fins 22 — 23, in the dorsal 113 — n8, in 

 the anal 97 — 102. Hind-margin of pectoral not indented. (Finmark and towards Bear Island, 

 Norway-Shetland Slope, Faroe Channel, east of the Faeroes, Faeroe-Iceland Ridge, east of 

 Iceland, Nova Scotia; 150 — 300 (620) fathoms). /,. esmarkii Coll.; p. 27. 



^. Pyloric appendages present. Rays in the pectoral fins 20—22(23), in the dorsal 100 — 103, 

 in the anal 88—92. Hind-margin of pectoral indented. (Polar Depths west from Xorwa>-, 

 north from the Fseroe Isles and east from Iceland, Spitzbergen, northerly East- and West- 

 Greenland; 150— 470 fathoms). L. endipleurostictus ]&.\^tn\ P- 33- 



') .\ North .Vmerican species, L. atlaiilicus Jensen, is included in the key because I know it at first hand. /-. micro- 

 cephalus Jensen (from the Atlantic Ocean south from Iceland. 799 fatlioiiis; p. 53) is omitted, because the course of the lateral 

 line in this species cannot be determined with certainty — onh- one small specimen being known; for the rest, it is easily 

 distinguished from all the above species by reason of its small head, which is only 17,3 °o of the total length. 



