PLATE VI. 



Stricklandtnia davidsonii (page 86). 



Figure I. Dorsal view. 

 Side. 

 « lb. mnge. 



" Ic. Hinge view of a smaller speciratn witli the beaks groiinii off. It shows a 



section of the triangular chamber in the ventral valve. 

 " }d. A fragment showing the chamber. 



Stricklandinia BREVis (page 84). 



Figure 2, Ventral valve. 



2a. Dorsal valve. 



" 26. Side. 

 " 2c. Hinge. 



Stricklandinia canadensis (page 81). 



Figure 3. Imperfect ventral valve. 



Stricklandinia lirata (Sowerby). 



Figure 4. " A fragment of a dorsal valve, from a specimen in the Mas. of Prac. Geol ., 

 shewing, besides the adductor impressions, the processes, to which the spiral 

 arms were attached." From Davidson's " General Introduction"' PI. VII. 



Stricklandinia Gaspeensis (page 83). 



4a. A fragment of the ventral valve shewing the chamber. 



