Natural History of East Finmarlc. 13 



Genus Delavalia, G. S. Brady, 1868. 



Delavalia robusta, Brady & Robertson. 

 (PL I. fig. 19; Pi. II. figs. 1-3.) 



1876. Delavalia robusta, Brady & Robertson, Brit, Assoc. Report, 

 p. 196. 



A Delavalia which appears to be identical with D. robusta 

 wa-s not uiifrequent in gatherings from Klosterelv, Varanger, 

 and Bog Fiords. 



In the first pair of thoracic feet the inner branches, whicli 

 are two-jointed and rather shorter than the outer branches, 

 have the end joint distinctly shorter than the first one and 

 furnished with three terminal setee, the middle seta being 

 plumose and rather longer and more spiniform than the one 

 on either side. 



The basal joint of the fifth pair bears on its inner aspect 

 one very small and tluee elongated setee. The secondary 

 joint, which is subquadrate in outline, is furnisheJ with six 

 setae ; the three outermost and the inner setse are elongated, 

 but the other two are small, as shown by the drawing (fig. 3, 

 PI. II.). 



The caudal furcse are slender and nearly as long as the last 

 two abdominal segments. These Arctic specimens are very 

 similar to British specimens of the same species. 



Delavalia robusta, YdiV . Jinmarcliica, var. n. 

 (PI. I. figs. 14-18.) 



This form agrees generally with Delavalia robusta, but 

 differs in the following particulars : — (1) It is rather larger 

 than the typical form ; (2) the antennules (fig. 15) differ 

 slightly in the proportional lengths of the joints; (3) the 

 secondary joints of the fifth thoracic feet are distinctly 

 smaller than those of D. robusta (fig. 17), and there is also 

 a slight difference in their armature ; but otherwise, however, 

 this variety agrees very closely witli the typical form. 



Hab. Varanger Fiord, E. Finmark; not common. 



Delavalia mimica^ T. Scott. 



1897. Delavalia mimica, T. Scott, Fifteenth Ann. Rep. Fishery Board 

 for Scotland, pt. iii, p. 150, pi. i. figs. 1-9. 



This species was moderately frequent in gatherings from 

 Bog and Lakse Fiords, Vadso Sound, and Varanger Fiord. 

 Delavalia mimica differs so markedly from the typical 



