226 ON THE BllHTSH SPECIES OE ENTOMOSIEiCA 



I have seen but one male of this form, in the gathering from 

 Bayhall ; this has the short abdominal processes characteristic 

 of D. ohtusa, and appears to be the prevailing form of Daplmia 

 in Kent and Sussex. In the spring of 1892 I found it abund- 

 antly as follows in ponds at Bayhall, Tunbridge "Wells ; Arundel 

 and Angmering, Sussex. In the summer of 1897, in a shallow 

 pool by the side of the Irthing at Walton, Cumberland, I took 

 many specimeus, all of them immature, which seem to be refer- 

 able either to ohtusa or its variety. One of these is figured in 

 plate VIIL, figs. 21, 22. 



The figures of Daphnia propinqua given by Sars differ scarcely 

 at all from the Bayhall specimens. The British form has the 

 valve-margins rather less spinulose and the front of the head 

 seems to be more fully rounded, but otherwise there is no mate- 

 rial difference, except perhaps in size. But Sars reared his speci- 

 mens artificially from dried mud, which may account for a smaller 

 growth — 1-8 mm. It may be- noted that the figure of the male 

 Mo7ioculus pulex, given by Jurine {Histoire des Monocles), re- 

 presents an abdomen with ^hort processes corresponding to those 

 of D. obtusa. 



Daphnia Schoedleri, G. 0. Sars. PL IX., figs. 1-4. 



1862. Daphnia Scfioedleri, Gr. 0. Sars, Om de i Omegnen af 

 Christiania forekommende Cladocerer, p. 18. 



This species approaches closely D. pulex, but the dorsal and 

 ventral margins are much more boldly arched, and the spine is 

 long, slender, and directed slightly upwards towards the dorsum. 

 In all other respects it is like D. pulex, and Sars in his latest 

 memoir makes it a variety of that species. Length of the female, 

 2'1 mm. The male I have not seen.' 



The only place in which I have found D. Schoedleri is Min- 

 stead Mill Dam, Hants, where I took it, not very plentifully, in 

 June, 1890. 



Prof. Gr. 0. Sars has examined my specimens and considers 

 them to be identical with his D. Schoedleri. 



