PLATE O. 



Fig. 1. 



Fig. 2. 



Fig. 3. 



Fig. 4. 



Fig. 5. 



Fig. 6. 



9. 



Fig. 

 Fig. 

 Fig. 

 Fig. ]0 

 Fig. 11. 

 Fig. 12 

 Fig. 13, 

 Fig. 14 

 Fig. 15 

 Fig. 16, 

 Fig. 17 

 Fig. 18 

 Fig. 19 

 Fig. 20, 



Fig. 21. 

 Fig. 22. 



Canthocamptus illmoisensis, antenna of female. 



fifth foot of female. 

 " '' antennule. 



first foot. 

 " " caudal stylet. 



Canthocamptus northumbricus, var. americanus, fifth 



foot of female. 

 " antenna of female. 



" maxilliped. 



'* caudal stylet. 



" antenna of male, 



" first foot. 



fourth foot. 

 " fifth foot of male. 



" froatal area. 



Canthocamptus tenuicaudis, stylets. 



fifth foot of female. 

 Cyclops serrulatus, fifth foot, 

 fourth foot. 

 " " outer ramus of first foot. 



Canthocamptus northumbricus, inner ramus of third 



male foot. 

 " '* beak. 



" " maxilla. 



