46 



LYCODIN.€. 



Lycodes pallidns from J an Ma yen. 



(var. siiiiih's m.|. 



Tab. V. fig. 2 a. b, c, d & Tab. VI, fig. 3 a, b, e, J. 



I consider as belonging to a distinct variet}', 15 specimens which the Ingolf Expedition obtained 

 in the neighbourhood of Jan Mayen (St. 116), at 371 fathoms depth. Liitken (1. c.) had referred 

 10 of them to L. paUidits Coll., to which the>- indeed are closely related, the remaining 5 to L. 

 liitkenii Coll. to which they have a certain resemblance in colour-marking but no close relation other- 

 wise. In ni}- preliminary report (1. c.) I have formed these Lycodes from Jan Mayen into a separate 

 species (L. siiiith's), pointing out at the same time their near relationship to L. pallidns; with my 

 present increased knowledge of L. pallidns I consider it best to regard them as a local variety of 

 this species. 



The most important measurements of these specimens are as follows: 



Total length in mm. 



Length of the head — 



Distance between snout and anus — 



Height over the anus — 



49 73 74 



12 i8,5 I iS 



21 , 30,5 ! 31 



5 7,5 ! 7.5 



? I ? .5 



106 109 : 118 125 1251130:132 [134 143 j 1451 1701175 

 25,5 I 26 28 I 31 30 30 31,5. 31 37 I 35 1 40 44 



46 ! 4S 51 ; 53 1 55 j 55 57 j 56 i 62 60 73 75 



11,5 1 11,5 I2,5| 141 141 14 13 I 15,5 16 17 21 ig 



The body as to form has a great similarity to that in the t\pical L. pallidns, but it is 

 throughout somewhat higher, and is thus less elongated; the height over the anus amounts to 10 — 

 12,4° o of the total length. The tail again is throughout somewhat shorter, the distance between the 

 snout and the anus being 41,4—44% of the body's whole length. 



The head is of similar length as in the typical L. pallidns and amounts to 23 — 25,9% of the 

 total length. It appears however less lengthy, as the height over the neck is greater and as a rule 

 is contained not quite twice in the length; it is consequently less depressed, and its lateral aspects 

 approach more to the vertical. Seen from the side, its upper border from the neck to the posterior 

 margin of the pupil is almost horizontal, and then inclines sharply almost in a straight line down to 

 the snout. The ej'es are relatively a little larger than in the typical form, their longitudinal diameter 

 (in specimens of 118 mm. and over) being 4,7 — 5,6 °o of the total length; their upper margin projects 

 outwards over the level of the forehead; seen from above, there is a tolerably small space between 

 the two e)-es; on the cranium the breadth of the forehead is '/jo of the length of the head. The 

 snout is not depressed, as in the true L. pallidns , but somewhat high; on the whole its head is 

 higher than in the previous form whether the snout or the neck is considered. The length of the 

 postorbital part of the head is somewhat the same in both forms; consequenth', on account of the 

 greater dimensions of the eye, the snout is relatively a little shorter in the variety similis and 

 amounts to only 6,2 — 7,5 °/„ of the total length against 6,8 — 8,5 ° o (or more) in the typical L. pallidns. 

 The cup-shaped depressions along the margins of the jaws, and the nostrils are as in the topical form, 

 nor do the teeth show anv differences. 



