rHE FISHES, MOLLTJSCA, A.ND OTHEIl OBJECTS. 51 



culata and D. mucronata (Figs. 45, 46), complete 

 our present list. The latter has been also found 

 in the neighbourhood of London, but neither is so 

 common as those first referred to. 



The Cyclops, although frequently very abundant 

 in old tarns, is a very different object to the water- 

 fleas, though belonging to the same natural history 

 group. You may find it in such spots as that we 

 have been investigating, about June or July. When 



Fig. 45. Fig. 46. 



Daphnia reticulata (female). Daphnia mucronata (female). 



magnified, you see that its name is not badly ob- 

 tained, for it is a miniature, as far as its sight is 

 concerned, of those fabulous one-eyed monsters of 

 Greek mythology, employed by Vulcan to forge the 

 thunderbolts of Jove. Its form is elegant, and is 

 clad in a transparent horny shell, composed of many 

 pieces dovetailed and jointed together like a piece of 

 ancient armour. In the common species, Cyclops 

 quadricornis, this covering consists of ten plates or 



B 2 



