EXPLANATION OF PLATE XXI. 



POTAMOMYSIS ASSIMIUS, Sp. nov. 



Fig. I 



2 



o 



o 

 4 

 5 

 6 



7 



— Adult female, 5 mm. long, dorsal view. 



— Anteiinular peduncle, X 100. 



— Antennal scale and peduncle, X 100. 



— Endopod of first thoracic limb, X 100. 



— Endopod of second thoracic limb, X 100. 



— Endopod of eighth thoracic limb, X 100. 



— Telson, X 100. 



— Fourth pleopod of male, 4 mm., X 100. 



