of (lie Copepod Genus Nitocra. 215 



identical in all respects with Brady's A r . palustris, with the 

 exception that Brady describes the fifth foot of the male of 

 that species as ''obsolete, being reduced to a minute seti- 

 ferous lobe," so that it was evident, either that N. palustris 

 is synonymous with N. spinipes, and not with N. typica, as 

 Prof. Sars states, or that it is a species distnict from both. 



Through the kindness of Dr. Caiman, I have been allowed 

 to examine all the specimens of the genus in the Norman 

 Collection in the British Museum. This collection contains 

 specimens (named as N. palustris) from seven localities, and 

 in all cases the females were found to be indistinguishable 

 from N. spinipes. In four cases only were males present, 

 but these males also agree exactly with those of N. spinipes, 

 so that all the specimens in the Norman Collection may be 

 regarded as belonging to that species. Prof. Meek has been 

 good enough to send me a slide containing specimens 

 collected by Prof. Brady at Oulton Broad, Suffolk, and 

 named by him Canthocamptus palustris, and, as this is one 

 of the original localities given by him, the specimens may be 

 regarded as co-types. Unfortunately no males were found 

 upon the slide, but the females agree in all respects with 

 N. spinipes. The Norman Collection includes examples 

 from Seaton Carew, Durham, which were probably named 

 by Dr. Brady, and among these were one or two males 

 having the fifth foot as in N. spinipes, so that there can be 

 no doubt that N. palustris (Brady) is not a distinct species, 

 but is synonymous with N. spinipes, Boeck, as described by 

 Prof. Sars. Van Douwe * figures the fifth foot of N. palus- 

 tris as a broad plate with four setae, but, as he does not 

 appear to have met with the male himself f probably his 

 figure is taken from Dr. Brady's, which, in my opinion, 

 represents the basal part only, the distal joint having been 

 overlooked. 



The following synonymy and short description will suffice 

 to discriminate the British species of Nitocra : — 



1. Nitocra hibernica (Brady). 



Canthocamptus hibernicus, Brady, Mem. British Copepoda, xi. 1880, 



p. 52. 

 Nitocra hibernica, Schmeil, Deutsch. Freil. Cop. 1893, p. 78. 



Abdominal segments with rings of spines complete 

 dorsally. Dorsal surface marked with very fine cilia. 

 Furcal rami longer than wide. 



* ' DeutscMands Susswasserfauna,' Heft xi. 1909, p. 57. 

 t Zool. Anz. xxix. 1905, p. 519. 



