NON-PARASITIC MAEINE COPEPODA. 435 



Genus ECTINOSOMA, Boeck. 

 1. Ectinosoma melaniceps, Boeck. PL XX., figs. 1-12. 



Off Seaton Carew and Seaham Harbour in company with the 

 foregoing species, but less abundantly. 



The characters of this remarkable species are so distinct that 

 I cannot doubt its identity with that described by Boeck, though 

 I have not noticed anything in my specimens which warrants 

 the term melaniceps. Moreover the fifth foot consists of two 

 branches, and not of one only as stated by that author, unless 

 indeed, the Norwegian animal be a different but closely allied 

 member of the same genus. 



Genus TACHIDIUS, Lilljeborg. 



1. Tachidius brevicoenis (Miiller). 



Cycloids brevicornis, Miiller, Entomostraca, p. 118. 



Tachidius brevicornis, Lillj., De crustaceis. Brady, Nat. Hist. 

 Trans. N. and D., Vol. IV., p. 130, PI. V., figs. 1-9. 



In pools of brackish water at Hartlepool, Hylton Dene, and 

 Seaton Sluice. 



Genus IDYA, PMlippi. 



1. Idya furcata (Baird). 



CanthocamjJtus furcaius, Baird, Brit. Entom. (1850). 

 Tisbe furcata, Lilljeborg, De crustaceis (1853). 

 Tisbe ensifer, Fischer, Beitr. zur Kennt. der. Entom. (1860). 

 Iyda barbigera (?) Phil., Weigmann's Archiv. (1843). 



Very common amongst weeds in tide pools. 



Genus WESTWOODIA, Dana. 



1. Westwoodia nobilis (Baird). 



Harpacticus nobilis, Baird, Brit. Entom. 



One specimen on Laminaria saccharina at Roker (1871). Ber- 

 wick Bay (Dr. Baird). 



