Natural History of East FinmarTc. 25 



tlic Britisli species belonging to tlie genus Thalestris ; but 

 there does not seem to be mucli known respecting its distri- 

 bution outside the British area. 



Thalestris longimana, Glaus. (PI. IV. figs. 8-13.) 



1863. Thnb-sfris lomjhnana, Glaus, Die frei lebendon Copepodcn, p. 130, 

 t. xviii. figs. 1-11. 



A single specimen of Thalestris longimana was obtained in 

 the Varanger Fiord gathering. The dissections represented 

 by the drawings have been carefully compared with similar 

 dissections of Scottish specimens, and tho only important 

 difference observed was in the basal and secondary joints of 

 the fifth pair of thoracic feet. In the specimen from Varanger 

 Fiord the basal and secondary joints of the fifth pair (fig. 12) 

 are not so broadly foliaceous, both branches being of a more 

 cylindrical form ; but this difference may be only accidental 

 or due, perhaps, to the specimen being scarcely mature. The 

 antennules (fig. 9) and the second maxillipeds (fig. 10) are 

 identical with the same appendages in Scottish specimens. 

 In the second maxillipeds the inner concave part of the hand 

 has the same minutely tuberculated surface peculiar to that 

 species; the general form of the hand is also exactly similar. 

 I'h. longimana, which was first recorded by Prof. Glaus from 

 Heligoland, has a distribution apparently coextensive with 

 the British Islands ; it was recorded by the liev. A. M. 

 Norman in 18G9 from Bressay, Shetland*, and from various 

 other places around our shores by Prof. G. S. Brady f and 

 others. Its occurrence in the gathering from Varanger Fiord 

 extends its distribution to the Arctic seas. 



Thalestris Normani, sp. n. (PI. HI. figs. 12-18.) 



This Thalestris closely resembles Thalestris frigida 

 T. Scott, in its general appearance and size, but differs from 

 that species in several details of structure. The following is 

 a brief description of the species : — 



(1) The female. — The antennules of the female are com- 

 posed of nine joints ; the first four, which gradually decrease 

 in length, are together about twice the length of the remaining 

 five joints; the fifth, seventh, and eighth joints are smaller 

 than any of the others (fig. 13). 



* " Last Report on Dredging among the Shetland Isles," Brit, Assoc 

 Report for 1868 (published 1869), p. 297. 

 t Brit. Copep. vol. ii. p. 136 (I8«0j. 



