362 CRUSTACEA OF NORTHUMBERLAND AND DURHAM 



Centropages hamatus (Lilljeborg). 



1865. Ichtliyophorba hamafa, Brady, Nat. Hist. Trans. 

 Northumberland and Durham, vol. i., p. 39, pi. iv., 

 figs. 7-10. 

 1878. Centropages haniatus, Brady (3), vol. i., p. 67, 



pi. viii., figs. 11-13. 

 1901. Centropages ha/natus, G. O. Sars (6), vol. iv., p. 76, 

 pi. lii. 

 The two foregoing species are of frequent occurrence in the 

 open sea; less frequent in tidal pools. N.D. 



IsiAS CLAViPEs Boeck. 



1878. Isias clavipes, Brady (3), vol. i., p. 62, pi. vii., 



figs. ?>'T^Z' 



1901. Isias clavipes, G. O. Sars (6), vol. iv., p. 79, pis. liii., 



liv. 



This species, though generally distributed round the British 



Islands, had not been noted in our district until quite recently; 



but in several tow-net collections made during the summer 



of 1905 it occurred rather plentifully. N.D. 



Fam. 4.— DIAPTOMID^ 



DiAPTOMUs CASTOR (Jurine). 



1875. Diaptomus castor, Brady (in part) (3), vol. i., p. 59, 



pi. vi., figs. 6-13, and (6) p. 92, pi. xi., figs. 1-6. 



1 90 1. Diaptomus castor, G. O. Sars (6), vol. iv., p. 85, 



pis. Ivii., Iviii. 



This species is found for the most part in ponds and 



ditches — not so often in larger sheets of water ; not common 



in our district, nor perhaps in any other part of the country. 



In ponds at Shotton, Sunderland, and Wardley (G. S. B.) ; 



Broomley Lake (A. M. N.) N.D. 



Diaptomus gracilis G. O. Sars. 



1862. Diaptomus gracilis, G. O. Sars, Oversigt af de 



indenlandske Ferskvandscopepoder, p. 9. 

 1891. Diaptomus gracilis, Brady (4), p. 94, pi. xi., figs. 7-9, 



pi. xii., figs. 1-8. 



