410 Mr. Lubbock on new species of Entomostraca. 



abdomen is four-jointed, and the basal segment bears on each 

 side a large plumose hair, which passes backward and outward. 

 Upon the fourth caudal seta (counting from the outside) is an- 

 other, rather smaller than the other five. It lies so close to the 

 fourth seta, that it might easily be overlooked. For the sake of 

 clearness, however, I have in my figure separated them. 



Length of cephalothorax '037, of abdomen '012; total '049; 

 of antenna '027. 



Caught at Weymouth, October 1857. 



PI. X. figs. 7 & 8. 



EXPLANATION OF THE PLATES. 



Plate X. 



Fig. 1. Calanus Euchceta, in outUne, seen from above ; X 65. 



Fig. 2. Ditto. End of left anterior antenna ; X 65. 



Fig. 3. Ditto. Antenna of the second pair ; X 250. 



Fig. 4. Ditto. Leg of the first pair ; X 65. 



Fig. 5. Ditto. Fifth pair of legs of the male ; X 125. 



Fig. 6. Ditto. Fifth pair of legs of the female; X 125. 



Fig. 7- Monstrilla anglica; X30. 



Fig.S. Ditto. Antenna; x65. 



Fig. 9. Calanus anglicus ; end of antenna ; Xl25. 



Fig. 10. Ditto. End of cephalothorax and abdomen, seen from the side ; 



X65. 

 Fig. 11. Diaptomus longicaudatus ; end of anterior antenna of male ; X 140. 

 Fig. 12. Ditto. Fifth pair of legs of male ; X 125. 

 Fig. 13. Pontella WoUastoni ; fifth pair of legs of female ; X 30. 



Plate XI. 



Fig. 1 . Diaptomus Bateanus ; X 65. 



Fig. 2. Ditto. End of cephalothorax, and beginning of abdomen, seen 



from the side; x65. 

 Fig. 3. Ditto. Fifth pair of legs of male ; X 50. 



Fig. 4. Pontella brevicornis ; end of left anterior antenna of male ; X 100. 

 Fig. 5. Ditto. End of left anterior antenna of female ; X 65. 

 Fig. 6. Ditto. Fifrti pair of legs of male ; X 100 ? 

 H^r. 7. Ditto. End of maxilliped; x250. 

 Fig. 8. Ditto. Fifth pair of legs of female ; X 100. 

 Fig. 9. Pontella WoUastoni ; front seen from above. 

 Fig. 10. Ditto. Anterior antenna of male ; X 65. 

 Fig. 1 1 . Ditto. Fifth pair of legs of male ; X 65. 

 Fig. 12. Diaptomus longicaudatus ; end of anterior antenna of female ; 



X65. 

 Fig. 13. Ditto. Leg of fifth pair of female ; X 130. 

 Fig. 14. CoryccBus anglicus; abdomen seen from above ; x(>5. 

 Fig, 15. Ditto. Abdomen and end of cephalothorax, seen from the side; 



X65. 

 Fi^'. 16. Ditto. Antenna of second pair ; X80. 

 Fig. 17. Ditto. Eyes; X250. 

 Fig. 18. Pontella WoUastoni; end of anterior antenna of female ; x65. 



