PLATE III. 



Ceisia. — Idmonea. 



Figure 1. — Crisia acuminata, 



la, part of a branch, front view ; \b,lc, id, terminal 

 processes, 



„ 2. — Crisia holdsworthii, ooecium, 



„ 3. — Idmonea australis, 



3a, front ; 36, back, 



„ 4. — Idmonea eboracensis, 



4a, front ; 46, ocecial dilatation, 

 4c, back, .... 



„ 5. — Idmonea fissurata, 



5a, front of young portion of zoarium ; bh, older 

 part ; 5c, back, 



Diam. 



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