138 BRITISH COPEPODA. 



weeds, but is sometimes dredged abundantly, and is 

 also taken by the tow-net in the open sea. On the 

 Durham coast it is not uncommon between tide- 

 marks. (Sunderland, Ryhope, &c.) 



I have specimens found amongst dredged material 

 from Portincross (Ayrshire), and in surface-net 

 gatherings taken by Mr. E. 0. Davison in the har- 

 bours of Valentia and Killybegs (Ireland). I have 

 dredged it abundantly amongst the Scilly Islands, 

 where, also, it was got in the surface-net; dredged 

 also off Scarborough, and in Lough Swilly. Mr. 

 Norman has taken it in Bressay Sound, Shetland, at 

 Oban, and at Tobermory, amongst weeds. 



10. THALESTRIS PELTATA (Boeck). PL LIII, figs. 11 19. 



Amenophia peltata, Boeck. Oversigt Norges Copepoder, p. 45 



(1864). 



Body depressed, broadly ovate ; abdomen con- 

 stricted at the base, and narrower than the cephalo- 

 thorax. Rostrum short, obtusely rounded. Ante- 

 rior antennae 9-jointed (fig. 12) ; first four joints 

 (peduncle) much longer and broader than those of the 

 terminal portion (flagellum), the first, third, and 

 fourth joints being nearly equal in length, the second 

 almost as long as the third and fourth together. Inner 

 branch of the posterior antenna (fig. 13) 3 -jointed. 

 Posterior foot-jaw (fig. 16) slender, hand elongated and 

 bearing a single seta on the middle of the inner 

 margin. Branches of the first pair of feet nearly 



