of tie Copepod Genus Nitocra. 219 



Fifth leg of female : basal joint with five sette, 2nd joint 

 narrow, with five setse. 



Habitat. Brackish water. Phlegraean Plain, Italy. 



(3) Nitocra frayilis, Sars. 

 Nitocra fragilis, Sars, Zool. Jahrb. (Syst.) xxi. 1905, p. 386. 

 Closely resembling N. spinipes. Differs from it in shape 

 of fifth leg. 



Habitat. Brackish water. Chatham Islands. 



(4) Nitocra platypus, Daday. 

 Nitocra platypus, Daday, Zool. Jahrb. (Syst.) xxiv. 1906, p. 192. 



Spine-rings of abdominal segments complete in last three 

 segments in S > incomplete dorsally in ? . 



First leg : rami of equal size. 



Fifth leg : ? — basal joint with one long seta and four very 

 small ones, 2nd joint small, with five short setse. S — basal 

 joint with three very short spines, 2nd joint with five short 

 setae. 



Habitat. Fresh water (?). Siam. 



The following species which have been ascribed to the 

 genus Nitocra should, in my opinion, be referred to other 

 genera : — 



(]) Nitocra paradoxa, D'ddny . 



Nitocra paradoxa, Daday, Zool. Jahrb. (Syst.) xix. 1904, p. 492 

 (Turkestan). 



The possession of two egg-sacs, the structure of the man- 

 dible-palp, and the absence of denticles on the operculum, 

 together with the arrangement of the setee of the swimming- 

 legs bring this species within the definition of the genus 

 Schizopera, Sars, eight species of which have been described 

 by Prof. Sars from Lake Tanganyika, while he notes the 

 occurrence of species also in the Chatham Islands, Caspian 

 Sea, and in Birket-el-Kurun, Egypt. 



(2) Nitocra phlegrau, Brehn. 

 Nitocra phlegr&a, Brehm, Zool. Anz. xxxiv. 1909, p. 422 (Italy). 



Brehm's description is somewhat incomplete, but the 

 extreme elongation of the endopodite of the first leg and 

 tbe form of the sensory spine at the base of this leg in the <§ 

 agree more with the genus Ameira than with Nitocra. 



