40 A REVISION OF THE BRITISH SPECIES OF 



The genus Eurytemora may be defined as follows : — Head 

 distinct from thorax, conical in front and having a bifid rostrum; 

 fourth and fifth body-segments distinct; the fifth segment in 

 the female produced into pointed alaei'orm processes. Abdomen 

 of the male five-, of the female three-jointed. Anterior antennae 

 twenty -four- jointed, and bearing a well developed terminal pa- 

 pilla; eighth and ninth joints incompletely separated, in the male 

 hinged between the eighteenth and nineteenth joints. Posterior 

 antennae and mandibles as usual in the Calanidae : maxilla and 

 maxillipeds relatively small. Distal portion of the posterior 

 maxilliped four-jointed, short and slender. Inner branch of 

 the first pair of swimming feet one-jointed, of the following 

 pairs two-jointed. Outer branches of the swimming feet in both 

 sexes three- jointed ; terminal spines slender and finely serrated. 

 Fifth pair composed of one branch only, in the female four- 

 jointed, in the male unlike on the two sides and ending in two- 

 jointed hooked claws. 



1. Eurytemora Clausii, (Hoek) (PI. XIIL, figs. 1-5). 



1853. Cyclopsina lacinidata, Fischer (8), p. 86, pi. II., 



figs. 4-17, 34. 

 1853. Temora velox, $ Lilljeborg (9), p. , pi. XX., figs. 2, 7. 

 1865. ,, „ Boeck (21a), p. 17. 



1865. „ „ Brady (22), p. 38, pi. L, fig. 16 ; 



pi. III., figs. 1-11. 

 1876. ,, Clausii, Hoek (29), p. 23, pis. IT., Y. 

 1878. ,, velox, Brady (32), p. 56, pi. VI., figs. 1-5. 

 1881. ., Clausii, Claus (36), p. 9, pi. II., figs. 1-7. 

 1885. Temorella Clausii, Poppe (43), p. 180, pi. IV., figs. 1-9. 



1888. ,, ,, Nordquist (51), p. 59, pi. V., fig. 8; 



pi. VI., figs. 6-8. 



1889. Eurytemora lacinidata, De Guerne & Eichard (62), 



p. 82, figs. 44, 45. 



Last segment of the thorax produced at the posterior angles 

 into hook-shaped alaeform processes; caudal rami abont four 

 times as long as broad, setae short, not exceeding the length of 

 the furca. Caudal rami and last abdominal segment densely 

 clothed with short rigid hairs. Anterior antennae reaching to 

 the posterior extremity of the cephalothorax. Terminal claw 



105 



