: r, 



Overkjæven er tydelig! Længere, end Uhderkjæven, og 

 Smulen krumbøjet; Mundspaltep naar tilbage til Øjets 

 Forrand. 



Øjnene ere middels storr og tætstaaende, samt inde- 

 holdes omtrent 4 Gange i Eovedlængden ; bos ældre Indi- 

 vider blive Øjnene relativt mindre, og Forholdet er her 

 omtrent som 1 : 5. 



Næseborene ere 1 Par, der bære kurte Tuber; lige- 

 som Ims de øvrige Arter aabner sig loran og bag hvert af 

 dem eu større Pore. 



Gjællespalterne ere vide. og naa paa Hovedets Under- 

 side frem til under Øjets bagreBand. Gjællebinderne have 

 6 Straaler, der ikke ere bedækkede .-it Gjællelaaget (saa- 

 ledes. sum det er Regelen Ims L. maculatus), og som derfor 

 altid let kunne tadles. 



Tænderne ere tilstede hint i Kjæverne, og eie i en- 

 hver Alder temmelig spinkle, hvilket staar i Overensstem- 

 melse med de idethele spinkeltbyggede og kurte Kjæver. 

 I Overkjæven danne de tiere tætte Bækker, i Underkjæven 

 blot en enkelt, der forti! bliver dobbelt. 



Anus er, sammenlignet med hvad det er Tilfældet hos 

 de foregaaende Arter. L. medius og L. maculatus, belig- 

 gende langt tortil. saaledes at Halepartiet bliver relativt 

 længere, end hos de 2 nævnte Arter, [sær er dette Til- 

 taklet hos de ældre Individer, hvor Halen kliver over 

 dobbelt saa lang. som Partiet foran Anus. Medens saa- 

 ledes hos disse sidste Legemets Længde foran Anus forhol- 

 der sig til Længden hag samme (Halen), som 1 : 2.1, er 

 samme Forhold hos de yngre omtrent som 1 : 1.7. 



Finnerne. Dorsalen begynder ret over Pectoralemes 

 Ovre Eod. og har de forste Par Straaler kortere, end de 

 øvrige, og ved Roden næsten fri, dog aldrig saa distinct. 

 som hos L. maculatus. Antallet af Straaler er nogen 

 Variation underkastet, men er dog idethele højere, end bos 

 nogen af de øvrige arctiske Arter 1 af denne Slægt. Det 

 hojeste Antal i Dorsalen synes at være 74. hvilket Kroyer 

 kar tumlet hos et grønlandsk Individ, ligesom jeg kar fondet 

 det samme kos et Individ fra Norge. 73 kar Stuwitz (i 

 1837) fundet bos 2 Individer, ligeledes fra Norge; de fleste 

 norske Individer synes at kave 71 eller 72 Straaler i Dor- 

 salen, de samme Tal. som Malmgren fandt kos et Par In- 

 divider fra Spitsbergen, ligesom Xordhavs-Expeditionens 

 Individ fra samme Localitet havde 71. Mohr opgiver lige- 

 ledes 72 for sit Typ-Exemplar fra Island, og samme Tal 

 fandt Malm kos et Individ fra Bohuslen i Sverige. Det 

 laveste observerede Antal synes at have været 68 (bos 5 

 norske Individer). Sin største Højde har Pinnen noget 

 foran Midten, uden dog at aftage i nogen s.ærdeles betyde- 

 lig Grad bagtil. 



Analen har, som de øvrige Arter. 1 kort Pigstraale. 

 og Pesten leddede, og i Spidsen kløvede Straaler. Denne 

 Klovning tiltager med Alderen, saaledes at den kos ældre 



1 1.. .sv ,/,. -iitiims. iSlnivri I'm XiinUiiiieneris I tstkyst har: D. 76, A. 55 

 (Gill 1864, etter i undersøgt Exj.l.i. 



Upper jaw perceptibly longer than lower; snoutaqui- 

 line; clefl of mouth reaching hack to anterior margin of 



the eye. 



Eyes of moderate size, and closely set; longitudinal 

 diameter is to total length about as 1 to 4; in mature 

 specimens, the eyes relatively smaller, the proportion being 

 nearly as I to 5. 



One pair of nostrils, furnished with short tubes; a 



large pore occurs, as in the other species, anterior and 

 posterior to each nostril. 



Branchial opening wide, reaching forward on under 

 surface of head to the posterior margin of the eye. Bran- 

 chiostegous membranes furnished with ti rays, not covered 

 by the gi'1-plate (as is generally the case with L. macula- 

 tus), and hence easy to number. 



Teeth in jaws only, and at every stage of growth 

 rather slender, a feature corresponding with the character 

 of the jaws, which are feeble and skort. In the upper jaw. 

 they constitute several closely arranged series; in the lower, 

 a single row only, the fore part of which is double. 



Vent placed far in advance, as compared with its posi- 

 tion in L. medius and L. maculatus, the caudal region 

 being relatively of greater length than in either of the 

 two latter species. This is more particularly the case with 

 adults, which have the tail twice as long as the region 

 anterior to the vent. Hence the length of the body anterior 

 to the vent in mature individuals, is to the postanal region 

 (the tail) as 1 to 2.1. whereas the proportion in compara- 

 tively young examples is as 1 to 1.7. 



Fins. — Dorsal commencing immediately above the 

 upper root of the pectorals, the two first rays shorter than 

 the rest, and almost free at hase. hut never so distinct as 

 in L. maculatus. The number of rays is found to vary 

 somewhat, as a rule however exceeding that in any of the 

 other Arctic species 1 of this genus. The greatest number 

 of dorsal rays would appear to be 74. observed by Kroyer 

 in a Greenland specimen: and I kave myself met with the 

 same number, in an individual taken on the coast of Nor- 

 way. Stuwitz found (1837) 72 rays in two specimens 

 obtained off the Norwegian coast: the majority of Norwe- 

 gian individuals would appear to kave 71 or 72 rays. 

 the number found by Malmgren in two specimen from 

 Spitzbergen; the individual taken on the North Atlantic 

 Expedition in the same locality kad also 71 rays. Mohr, 

 too. gives 72 for kis typical specimen from Iceland, and' Malm 

 observed 72 in an example taken on the coast of Swe- 

 den. offBohuslen. The smallest number appears to be 68 

 (in 5 Norwegian individuals). Tke greatest depth of the 

 fin occurs a little anterior to the medial point, dimin- 

 ishing but very slightly throughout the posterior half. 



Anal, as in the other species, furnished with one short 

 spinous ray; the other rays are all articulated and cleft 

 at the points. This division, increasing with the growth 



1 /.. scrpentinus, (Storer), occurring on the eastern shores of North 

 America. Ikis: I). 76; A. 55 (Gill 1864; one specimen only examined). 



10 



