22 BRITISH OOPEPODA. 



have memoranda : Seaton Sluice (Northumberland), 

 Hylton Dene and Hartlepool (Durham), Oulton Broad, 

 Maningtree, and Lake Lothing (Suffolk), pond at St. 

 Mary's, Scilly Islands. 



Genus 6. EUTERPE, Glaus (1863). 



Anterior antennae 7-jointed. Second pair of foot- 

 jaws elongated, 3-jointed, armed with a long, slender 

 claw. Both branches of the first pair of feet 2-jointed. 

 Abdomen in both sexes 5-jointed. 



1. EUTERPE GRACILIS, Glaus. PI. XL, figs. 1 16. 



Euterpe gracilis, Glaus. Die frei-lebenden Copepoden, p. 109, 

 t. 14, figs. 113 (1863). 



Body slender, produced into a stout rostrum ante- 

 riorly, somewhat sigmoid in outline when seen from the 

 side, the dorsal cephalothoracic margin being strongly 

 arched (fig. 1). Abdomen short, about as long as the 

 last three thoracic segments, and not sharply separate 

 from the thorax. Anterior antennas 7-jointed ; shorter 

 than the first body-segment; in the female (fig. 3) slen- 

 der, beset somewhat sparingly with hairs, and bearing 

 on the fourth joint (fig. 3a) a stout setose appendage ; 

 length of the several joints nearly equal; in the male 

 (fig. 2) the fifth and sixth joints are coalescent, and 

 form an elongated vesiculiform swelling; last joint 



