83 



Stricklandinia Gaspeensis. (Billings.) 1859. 



Plate G, fig. 4a. 



Stricklandia Gaspeensis. (Billings.) Canadian Nat. and Geol., vol. 4, p. 134, 1859 



Description. — Shell large, oval, greatest width about the mid-length or 

 a little in front thereof, the anterior half usually more broadly rounded 

 than the rostral half ; length to breadth about as five is to four ; valves 

 nearly equally and rather strongly convex. The ventral valve in a large 

 specimen is about three lines longer than the dorsal, (the excess of length 

 being at the umbo and beak) ; beak small, closely incurved down and 

 touching the umbo of the dorsal valve, the point of contact being 

 rather on the ventral side of the plane of the lateral margin ; umbo 

 convex, the cardi nal angles somewhat compressed ; area from one-fifth to 

 one-fourth the width of the whole shell in length ; strongly incurved on 

 each side of the beak, becoming flat towards the margin, where it forms 

 an obtuse angle to the length of the shell. The tri-angular chamber 

 reaches the beak, and forms a large foramen in the area ; inwardly it 

 projects nearly to the shell of the dorsal valve. 



Fig. 49. 



Fig. 49STRICKLANDLVIA Gaspeensis. DoFsal view of a large specimen-, of the variety with 

 truncated front margin. 



