PLATE 1A: 



Crenella ? I'ARVi'LA (pagc 51). 



Figure 1. Side view of a perfect right valve, mucli enlarged. The cniss- 

 lines below (to the right), indicate the exact size. 



Anodonta I'ROpatokis (jiagc 58). 



Figure 2. Side view of a cast of the interior of a shell from near Bull's 

 Head, which is doulitfnlly referred to this species, shewing 

 the left valve. 

 " '111. Tlie same siiecinieu as viewed from above. 



iSpii-krum EiiuMdsrM, Vac, (pagc (51). 



Figure :;. Lateral outline nf a riglit valve, consideralily enlarged. The 

 crds.s-lincs to llio right show tlie natural size of the s]iccinien. 



Unh) f!(iNSUETi;s (page 59). 



Figure 4. Side view of the only perfect specimen coherled. 

 '' ill. I >o)sal aspect of the same. 



