PLATE LIII. 



1-3. RETEPORA BEANIANA, p. 391 ; nat. 



size. 



* - , zooecia. 



, dorsal surface. 



6, 7. RETEPORA COUCHII, p. 395; nat. size. 

 3, 10. - _, zooecia. 



9 - , dorsal surface. 



11 ) elongate avicularium. 



