PLATE 9. 



Reconstruction of the posterior end of the body from transverse sections. 



Fig. 1. Strophomenia ophidiana. 



Fig. 2. Dorymenia acuta. 



Fig. 3. Stiophomenia triangularis. 



Fig. 4. Strophomenia spinosa. 



Fig. 5. Lophomenia spiralis. 



