u • 



Fahr., none being found in the cooler mud. On the other hand, 

 none of C. incongruens were found at the margins in the greater 

 heat with C. vidua. C. incongruens swims briskly through the 

 water in confinement. When brought to the side with the brush, 

 it shuts its valves and ceases to move, making no attempt to 

 escape, and seldom resuming action for some time. 



Cypris virens, Jurine. 



Qypris virens, Lillj. De Crust, ex ord. trib., p. 117. 



Brady. Mon. Bee. Brit. Ost., p. 364. 



Brady, Crosskey, andBobertson. Mon. Post-ter. Ent., p. 124. 



Monocidus virens, Jurine. Hist, de Monocles, p. 174. 

 Cypris tristriata, Baird. Brit. Entom., p. 152. 



A common species in ponds and ditches, sometimes in ponds more 

 or less brackish, above high- water mark. In confinement it swims 

 with great briskness, yet it is easily brought to the side with a 

 camel-hair pencil, and lies motionless for a time before resuming 

 its activity. When left on the surface of the water it seems to 

 have little power to go down again. When attempting to swim 

 on the surface, it goes round and round in a very circumscribed 

 circle, appearing at times as if turning on a pivot; yet when under 

 water it makes frequent curves and deflections. It can swim in 

 straight lines, but apparently not with the same speed. When 

 swimming, all the feet, as well as the antennae, appear to be in 

 motion. The colour is generally green, but subject to much varia- 

 tion from that colour to greenish drab — in some cases banded or 

 mottled with greenish black. 



Cypris obliqua, Brady. 

 Cypris obliqua, Brady. Mon. Bee. Brit. Ost., p. 364. 



Common in tarns and ponds. In great abundance in a tarn on 

 the hill above Calium's Bay, south-east end of Bute; abundant and 

 dark in colour in an old quarry hole, subject to the spray of the 

 sea, Cumbrae; but when the gathering was taken, the water was 

 nearly dried up, and the weed all in a state of decay. Common in 

 a tarn on a hillside on Craigengower farm, and all bright green. 

 In a gathering at Glen Helen, Isle of Man, the colour being a 

 fine brown; Isle of Skye moderately common. 



