Remarks on Myctophum glaciale (Reinh.). 27 
be considered as belonging to a size-group (group III) not (or 
very rarely) represented in the Atlantic collections. This, | think, 
is evident from the accompanying graph. (Fig. 3). I have here 
specified the length and number of specimens caught from May 
to August along our coast and in adjacent parts of the Nor- 
wegian Sea. The material is distributed on three size-groups. 
One could justly consider this feature as accidental, on account 
of the small number of specimens dating from miscellaneous 
Gr Gr. II i Grell 
80 mm. 
Fig. 3. å and number of specimens aa å within the Ene faunal 
area and in adjacent parts of the Norwegian Sea in the suminer months. 
years. The correspondence with the larger Atlantic material from 
the same season of the year shows, however, that this feature is 
due to a common cause,—the regularity of the life-history of 
the species. 
A special interest attaches to the group III]. As mentioned 
above, from the Mediterranean no specimens are known exceeding 
the group I. In the Atlantic the species attains a maximum length 
of abt. 60 mm. (group II), an individual of 68 mm. only taken 
once (“M. Sars” stat. 80 11-VII-1910). Holt & Byrne (1911) 
have in their ample collections from off Ireland only met with 
Specimens of a length of 61 mm. as maximum. From the Faroe 
