NON-PARASITIC MARINE COPEPODA. 439 



Harpacticus chelifer, Claus, Die frei lebend. Copep. (1863). 

 Harpacticus chelifer, Boeck, Oversigt Norges. Copep. (1864). 

 (Not H. chelifer of Lilljeborg). 



Not uncommon amongst weeds between tide marks. Roker, 

 Whitley, &c. In tbe open sea off Seaton Carew. 



2. Harpacticus gracilis, Claus. 



H. gracilis, Cls., Die frei lebend. Copep. (1863) 



H. elongatus, Boeck, Oversigt Norges. Copep. (1864). 



This occurs in the same situations, though not so frequently 

 as the foregoing species. M. Boeck doubts the identity of his 

 H. elongatus with Claus's gracilis on account of a difference in 

 the lengths of the antennal joints. This character, however, 

 seems to me to be often subject to considerable variation, and I 

 should not, without some divergence in other respects, be dis- 

 posed to separate the two forms. Indeed, both approach so 

 closely to H. chelifer that it seems questionable whether they 

 might not be more fitly regarded as varieties of that species. 



3. Harpacticus fulvus, Fischer. 



H.fulvus, Fisch., Beitrag. zur Kenntniss der Entom. (1860) ; 

 G-. 0. Sars, Som. 1862, Zool. Reise. 



H. curticornis, Boeck, loc. cit., p. 38 (1864). 



H. chelifer, Lilljeborg, De crustaceis ex. ord. trib. 



Tigriopus Lilljeborgii, Norman, Last Shetland Dredging Re- 

 port, p. 296. 



In pools at or above high water mark ; Bambro', Cullercoats, 

 Marsden. Boeck and Sars both describe this species as inha- 

 biting chiefly pools at or above high water mark, which are 

 liable to get warmed by the sun. In such situations it is often 

 extremely abundant in our district. 



4. Harpacticus nic^eensis ? Claus. 



Harpacticus nica:ensis, Claus, Die Copep. -fauna von Nizza, p. 

 31, PI. II., figs. 12-14. 



