96 BRITISH COPEPODA. 



antennae are short, geniculate*}, and 14-jointed. Fifth 

 pair of feet (fig. 1 0) 2-jointed, first joint very small ; the 

 terminal joint bears three lancet-shaped spines and 

 one or two smaller setse. Abdomen of the female 

 4-jointed, the first joint as long as the united lengths of 

 the rest ; caudal segments as long as the three preced- 

 ing joints, very slender, about eight times as long as 

 broad ; in the male much stouter and only three or 

 four times as long as broad ; tail setse finely plumose, 

 the longest as long as the abdomen proper. Colour 

 brown, variously marked according to habitat ; 

 antennas or caudal segments or both sometimes 

 darkly tinged with brown, and a similarly coloured 

 band across the first segment of the body. Ovisacs 

 large and divergent. Length y^-th of an inch 

 (1*4 mm.). 



Thorellia brunnea occurs not very uncommonly on 

 the fronds of Laminaria saccharina and other fuci 

 in littoral situations and beyond low- water mark ; in 

 such a habitat Mr. Norman found it abundantly at 

 Tobermory in the island of Mull, and I have myself 

 noticed it in Westport, Clifden, and Mulroy Bays, 

 Ireland, and on the Durham Coast. With Mr. 

 Uobertson I have also dredged it off the Island of 

 Cumbrae, and off the Yorkshire Coast in a depth of 

 35 fathoms. Kinsale Harbour (Mr. E. G. Davison). 



This genus would appear to be identical with Euryte 

 (Philippi), but the description aud figures given by that 

 author (Weigmann's ' Archiv,' 1843) are not copious 

 enough to warrant my adopting his generic name. 

 M. Boeck notices that the eye is not placed in the 



