PLATE VIII. 



Streptelasma prolifica, Billings (page 115). 



Figure 1. Longitudinal section of a specimen from the Corniferous limestone of Ontario. 

 Figure la. Transverse section of the same, beneath the bottom of the calyx. 



Zaphrentis patens, Billings (page 119). 



Figure 2. The type specimen, as seen from above. 



Figure 2a. Longitudinal section of the same with a restored dotted outline of the base : 

 s, septum ; /, f ossette. 



Zaphrentis Shumardi, Milne-Edwards and Haime (page 121). 



Figure 3. Side view of a specimen from near Owen Sound, Ont. (one of the types o f 



X. cinotosa). 

 Figure 3a. Transverse section of the same. 

 Figure 4. Longitudinal section of a specimen from Cap Bon Ami, N.B. 



Zaphrentis cingulosa, Billings (page 124). 



Figure 5. Side view of the type specimen ; reduced one-half. 

 Figure 5a. Longitudinal section of the same. 

 -Figure 56. Transverse section of the same. 



