PLATE 2 



Fig. 1 Oncovsoecui canadensis, u.sp., habit sketch (Eogick). 



Fig. 2 The same, ooecium and ooeciostome (Rogick). 



Fig. 3 The game, incompleted ooecium at edge of zoarium, showing relation 

 to zooecia (Eogick). 



Fig. 4 The same, diagram of a bilobate ooecium (Rogick). 



Fig. 5 Oncotisoecia diastoporides, zooecia, ooecium, and ooeciostome. 



Fig. 6 The same, ooecium and ooeciostome (Rogick). 



Fig. 7 The same, another ooecium of slightly different form (Rogick). 



Fig. 8 The same, base of colony, showing ancestrula (Rogick). 



Fig. 9 Oncousoecia (Alecto) dilatans (Thomson), corrected drawing of the 

 specimen figured by Hincks (B. M. P., pi. 61, fig. 5) as Tubulipora lobulata, and 

 taken by Canu as the genotype of Oncousoecia. 



Fig. 10 Tubulipora flabellaris, detail of ooecium and ooeciostome (Shannon). 



Fig. 11 Tubidipora liliacea, detail of ooecium and ooeciostome (Shannon). 



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