PLATE 48 



Pleurodictyum lenticulare Hall van laurentinum nov. 



Page 219 



1 Top view of a coralluin replaced by silica 

 Grande Grcve limestone. Grande Greve 



Hederella blainviIKi nov. 



Page 242 



2 A valve of L e p t o s t r o p h i a b 1 a i n v i 1 1 i i covered by a colony of 



this species, x i^ 

 Gaspe sandstone. Portage road 



Chaunograptus gracilis nov. 



Page 219 



3 A valve of L e p t o s t r o p h i a m a g n i f i c a carrying a growth of 



this species 

 4j 5 Enlargement of the fronds 



Grande Greve limestone ; division i. Grande Greve 



Alga 



Page 114 



6, 7 Natural size and enlarged views of the specimen described 



St Alban beds. Cape Rosier Cove 

 8 A fucoidal frond from the Grande Greve limestone. Grande Greve 



