PLATE 9 



Fig. 1 Illppothnu liijaUna, young zooecia at edge of zoarium. 



Fig. 2 The same, inside margin of colony, zooecia not crowded. 



Fig. 3 The same, much crowded condition, with numerous ooecia. 



Fig. 4 Hippothoa expansa, fertile and infertile zooecia and tlie expansion c 

 the margin of the dorsal side (Eogick). 



Fig. 5 Schizomavella auriculata, details of fertile zooecia. 



Fig. (3 Hippndiplosia smitti, fertile and infertile zooecia. 



Fig. 7 Sinittina, hella, highly calcified condition, showing ooecia covered 1; 

 neighljorinsr rooer-ia (except for the large ooeciopore). 



V\)i o k:iiii!iiia v^raiiulia ii.sp.. high calcification, ooecia not covered l>y tl 

 zooecia on either side. 



Fig. 9 The same, final stage of calcification. 



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