PLATE XV. 



Atrypa reticularis. 



Fig. 1. Ventral view of a very rugose specimen. Page 91 



Meristella iiasuta. 



Fig. 2-5. Cardinal, dorsal, profile and ventral view of specimen. Page 



Fig. 6-8. Cardinal, ventral and dorsal view of an interior cast. 



Meristella unisulcata. 

 Fig. 9-16. A series of specimens showing variations in size and form. Page 99 



