PLATE 28 



Camarotoechia semiplicata (Conrad) 



Pa|:e 108 



1 Dorsal view, x 3 



S^ Alban beds. Cape Rosier Cove 



Camarotoechia dryope (Billings) 



Page 170 



2 Ventral view of a shell provisionally referred to this species 

 Grande Greve limestone ; division 2. Grande Greve 



Uncinulus mutabilis Hall 



Page 171 



3 Exterior of dorsal valve ; a silica replacement 



4 Internal cast of dorsal valve 



5 Front elevation of conjoined valves ; silica replacement 

 6, 7 Exterior of ventral valves 



8 Interior of dorsal valve showing cardinal process, sockets and crura. 



X 3 

 Grande Greve limestone ; division 2. Grande Greve and Indian Cove 



Camarotoechia cf. ramsayi Hall 



Page 168 



9 Internal or sculpture cast of a ventral valve 



Grande Grlve limestone ; division 2. Grande Greve 



Plethorhyncha pliopleura (Conrad) 



Page 171 



10 Ventral valve 



1 1-13 Views of a well defined example 



14 Internal cast of ventral valve showing the small spondylium 



15 Internal cast of dorsal valve 



Grande Greve limestone ; divisions i and 2. Lehuquet's Cove 



Plethorhyncha barrandii Hall 



Page 171 



16, 17 Dorsal and ventral valves 



Grande Grtve limestone ; divisions i and 2. Grande Gr^ve 



308 



