TXVERTKRRATE FOSSTT.S. 20 



2219 Corbula alaeformis ('«f>f>. 



2223 Anatina quadrata (^nhh, 



2224 Thracia? occidentalis Mcfh. 



2225 Thracia? subtruncata Meek. 

 9226 Pholadomya subelongata Afcek. 



2229 Pholadomya Oregonensis (r'if>f>. 



2230 Pholadomya Sonorensis (r,i/)f>. U 



2231 Goniomya borealis ^f('r■k. 



2232 Pleuromya papyraoea Oahh. 



2233 Arcomya undulata Oahii. 



2234 Homomya concentrica Gahh. I. 

 2238 Cymbophora Ashburnerii (rabb. I. 

 2241 Asaphis multicostata r^bb. 



2255 Tellina aequalis Oabb. 



