PLATE XVIII. 



Willemcesia leptodactyla ; enlarged one and a half times (p. 163). 



c. Pleon ; lateral view. 



d. Siagon or mandible ; from the inside. 



e. First siagnopod or first maxilla. 



/.' Second siagnopod or second maxilla. 



7. Third siagnopod or maxilliped. 



h. First gnathopod. 



i. Second gnathopod. 



/. Coxa and basis of first pereiopod, showing mastigobranchial lash and podobranchial 



plume. 

 k". Chela of first pereiopod. 

 W. Podobranchia ; enlarged. 

 V" '. Series of small plates on the inner margins of pollex and dactylos. 



