CRUSTACEA OF XORTHUMBERLAXD AND DURHAM 



But no indubitably adult specimens have as yet been observed, 

 and it seems best under these circumstances to consider it as 

 an immature form of some other species — perhaps of C.viridis. 

 The same remarks apply to Cyclops Helleri\ 



Halicvclops ^equoreus (S. Fischer). 



1878. Cyclops (tquoreics, Brady (3), vol. i., p. 119. pi. xix., 

 figs. 8-10, pi. xxi., figs, 11-17, and (4) p. 91, pi. x., 

 fig. I (1891). 

 Claus in 1893 founded a new genus Hemicy clops with 

 Cyclops cequoreus as the type. The name, however, having 

 been previously used in a different sense by Boeck, Dr. 

 Norman has proposed to substitute for it that of Halicyclops* 

 H. cequoreus is essentially a brackish water species, occur- 

 ring not uncommonly in salt marshes and pools at the side of 

 estuaries. It seems to be generally distributed, but the only 

 local habitat at present known to us is Seaton Sluice, North- 

 umberland (G. S. B.) N. 



Fam. 2.— ASTEROCHERID^ 



Dermatomyzon nigripes (Brady and Robertson). 



1880. Cyclopicera nigripes, Brady (3), vol. iii., p. 54, 



pi. Ixxxix., figs. i-ir. 



1899. Dermatomyzon nigripes, Giesbrecht, Die Astero- 



cheriden des Golfes von Neapel und der angrenzenden 



Meeres-Abschnitte, Berlin, 1S99, p. 77, pi. i., fig. 4, 



pl. v., figs. 1-14. 



A fine and well characterized species, not uncommon in 



moderate depths of water. Off Marsden and Hawthorn in 25 



to 27 fathoms. Off Alnmouth 50 to 59 fathoms (G. S. B.) 



N.D. 

 Asterocheres lata (G. S. Brady). 



1880. Cyclopicera lata, Brady (3), vol. iii., p. 56, pl. Ixxxix., 



fig. 12, pl. xc, figs. 11-14. 



One specimen among algc-e in a tidal pool at Roker 



(G. S. B.) This species is normally parasitic on Echinus 



* On new generic names for some Entomostraca (Annals and Magazine of 

 Natural History, ser, 7, vol. si., April, 1903). 



148 



