36 



THE LIFE OF CRUSTACEA 



ChirocephaluSf have no carapace, form the order 

 Anostraca. 



A second order, the Notostraca, is represented 



by A pus cancriformis (Plate II.), which occurs in 



A 



Fig. u—Estheria obliqua, One of the Conchostraca. 

 (After Sars, from Lankester's " Treatise on Zoology.") 



A, Shell of female, from the side ; B, male, from the side, after 

 removal of one valve of the shell. (Enlarged.) a', Antennule ; 

 a", antenna ; ad, muscle which draws together the valves of the 

 shell ; /, tail fork ; md, mandible 



many places in Europe in ponds and puddles, and 

 very rarely indeed in Britain. In Apus there is a large 



