136 BRITISH COPEPODA. 



3-setose ; outer narrow, quadrate, armed with one 

 long, and four short, terminal setae. Length - 2 \th of 

 an inch (1*05 mm.). 



This is very similar in many respects to the following 

 species (T. longimana) ; but, besides the less gibbous 

 outline, less vivid colouring and more delicate skin, it 

 differs considerably in several anatomical points, 

 especially in the structure of the fifth pair of feet in 

 both sexes, and the inner branch of the fifth pair in the 

 male. The posterior foot-jaw, though similar in general 

 character to that of T. longimana, is much less robust 

 and less angular. T. hibernica was taken very spar- 

 ingly in the tow-net in Westport Bay (Ireland) and 

 rather more plentifully in a gathering off Cumbrae 

 (Firth of Clyde). Oban (Rev. A. Norman). 



9. THALESTEIS LONGIMANA, Glaus. PI. LX, figs. 1 13. 



Thalestris longimana, Glaus. Die frei-lebenden Copepoden, 

 p. 130,.t. xviii, figs. 111 (1863). 



Body very robust, cephalothorax much arched 

 dorsally, integument tliick and tough, rostrum broad 

 and blunt, body-segments bordered with chitinous 

 marginal bands, which are often deeply coloured, 

 brownish or blood-red, the general colour of the 

 animal being yellowish. Anterior antennae (figs. 2, 3) 

 9-jointed, joints of the peduncle long and stout, those of 

 the flagellum short ; inner branch of the posterior an- 

 tenna (fig. 4) 2-jointed, short ; mandible (fig. 5) strong, 

 with a large, well-developed palp ; maxilla (fig. 6) 



