D2, BRITISH UOPEPODA. 
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. Hurerpr, Claus (1863). 
Anterior antennze 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. Euterrs cracitis, Claus. Pl. XL, figs. 1—16. 
Euterpe gracilis, Claus. Die frei-lebenden Copepoden, p. 109, 
t. 14, figs. 1—18 (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 antennee 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 
