PLATE 24 



Leda brevirostris Hall 



Page 234 



1 Exterior of a left valve, x ly^ 



2 Internal cast of a left valve, x i^ 



3 Internal cast of a right valve with more extended posterior extremity 



and evidence of anterior muscular fulcrum, x 2 

 Gaspe sandstone. Gaspe Basin 



Palaeoneilo maxima (Conrad) 



Page 2y^ 



4, 5 Internal cast and exterior of a left valve 

 Gaspe sandstone. Gaspe Basin 



Palaeoneilo cf. constricta (Conrad) 



Page 233 



6 A characteristic right valve 

 Gaspe sandstone. Gaspe Basin 



Nuculites triquetrus Conrad 



Page 233 



7-10 Internal casts of both valves displaying the characteristic form and 

 clavicle of this shell 

 Gaspe sandstone. Gaspe Basin 



Nuculites sp. 



Page 162 



11 A small internal cast 



Grande Greve limestone ; division 2. Shiphead 



Cypricardinia distincta Billings 



Page 157 



12 The exterior of a rioht valve retaining^ the ornament and showing the 



normal proportions of the species, x 3 



13 A large valve with the sculpture destroyed 



14, 15 Right valves ; 15 x 3 



300 



