96 BRITISH COPEPODA. 



antennae are short, geniculated, 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 setae. 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 setae 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 -^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. 

 liobertson 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. 0. Davison). 



This genus would appear to be identical with Euryte 

 (Philippi),butthe description and 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 



