56 BRITISH COPEPODA. 



and the distal extremity : terminal setae plumose, not 

 quite equal in length to the tail segments. Colour 

 brown. Length ^th of an inch (1*3 mm.). 



Tevnora longicornis is one of the most abundant of 

 the marine Copepoda. It occurs often in great 

 profusion in tidal pools amongst seaweeds, and is 

 likewise taken abundantly in the towing net in the 

 open sea. It seems, in fact, to be ubiquitous in the 

 British seas. 



2. TEMORA VELOX, Lilljeborg, PL VI, figs. 1 5. 



Temora velox, Lilljeborg. De Crustaceis ex ordinibus tribus 

 Cladoc. Ostrac. et Copep., p. 177, tab. xix, figs. 9 

 and 10, and tab. xx, figs. 19 (1853). 

 Brady. Nat. Hist. Trans. Northumberland and 

 Durham, vol. i, p. 38, pi. i, fig. 16, and pi. iii, 

 figs. 111 (1865). 



Body robust, dorsum strongly arched, head distinct 

 from the thorax, last thoracic segment in the female 

 produced into two strong spines at the ventral 

 angle. Anterior antennae (figs. 1, 2) rather short and 

 stout, not much longer than the cephalothorax, 24- 

 jointed, moderately tapered to the apex, toward which 

 the segments gradually increase in length, those near 

 the base, up to the twelfth, being much broader than 

 long, and those from the sixteenth onward about twice 

 as long as broad ; the middle portion of the antenna is 

 densely setose on the outer margin, but the setae are 

 more scattered toward the apex ; the right antenna of 



