209 
is mentioned by Meinert as I. Nordmanni Rathke, differs from 
I. marina sens. Sars especially in having the lateral part of the 
head strongly expanded outwards and besides produced forwards 
as a large subtriangular plate, and in the abdomen being expanded 
Fig. 1—6. Jæra marina Fabr. 
at the middle — consequently a good deal broader in proportion to 
length — with its margin behind the middle a little concave. In I. 
Marina sens. Sars (figs. 1 and 3) the eyes are much nearer the 
lateral margin, the latero-anterior lobes of the head are small and 
short, while the lateral margin of the abdomen is more or less mani- 
Vidensk. Meddel. fra den naturh. Foren. 1909. 14 
