Explanation of Plate XVII. 



Fig. I. Oothecae of Mantid from Delagoa Bay. 



A. An ootheca cut open, showing the eggs and median 



septum. 



B. Portion of oothecal wall removed from A. 



C. Intact ootheca. 



2. Ootheca of Mantid from the Andes split open to show the 

 central egg- mass. 



