Natural lUstorij of East Finmarh. 13 



Genus Delavalia, G. S. Brady, 1868. 



DeJavalia robusta, Brady & Robertson. 

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



1875. Delavalia robusta, Brady & Robertson, Brit. Assoc. Report, 

 p. 196. 



A Delavalia wliicli appears to be identical with D. rohusta 

 was not unfrequent in gatherings from Klosterelv, Varanger, 

 and Bog Fiords. 



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

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

 have the end joint distinctly shorter than the first one and 

 furnished with three terminal setse, the middle seta being 

 plumose and rather longer and more spiniform than the ouo 

 on either side. 



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

 one very small and three elongated seta?. The secondary 

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

 setge ; the three outermost and the inner sette are elongated, 

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

 PL II.). 



The caudal furcas 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 rohusta^ YSiV . Jlnmarchica, var. n. 

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



This form agrees generally with Delavalia rohusta, 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. rohusta (fig, 17), and there is also 

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

 this variety agrees very closely with the typical form. 



Hah, Yaranger 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 



