PLATE 30 



Meristella champlaini nov. 



Page 175 



1-4 Views of a normal mature shell 



5-7, 8, 9-1 1 Other examples with some degree of variation in the flatten- 

 ing of the ventral valve 

 12, 14 Anterior views, showing variations in the sinus 

 13 Internal cast of ventral valve 

 15 A profile 



16, 17 Internal cast of a large, somewhat flattened ventral valve, and 

 enlarg^ement of the vascular surface 



18 A small shell radially marked on the interior of the dorsal valve 



19 Interior of a dorsal valve 



20 Exterior of a larcre ventral valve 



Grande Greve limestone ; divisions i and 2. At various outcrops about 

 Grande Greve, Lehuquet's and Indian Coves, and Shiphead 



Meristella lata Hall 



Page 177 



21-23 The usual expression of this species at this locality, showing the 



broadly flattened body and umbonal slopes of the ventral valve 



Grande Greve limestone. Perce Rock 



24, 25 Exterior and interior of a silica replacement of the ventral valve 



26 A dorsal valve 



Grande Greve limestone. Grande Greve 



312 



