50 



HALF-HOURS IN THE GREEN LANES. 



greater size, although its eyes are smaller in com- 

 parison. Another species, common about London, is 

 D. vetula (Fig. 44), or the " spineless " water-flea, so 



Fig. 44. 







Daphnia vet/tla (female). 



called on acconnt of its not having the spine at the 

 end of the body, which is so distinctly seen in the 

 aforementioned species. Two other species, D. reti- 



