BRACHIOPODA—PROTREMATA. 



221 



- 



i 



FlG. 268. Strophonella headleyana, profile ancT ventral view^(exterior) ; interior 

 ofile of pedicle valve. (AfterJHall.) 



FlG. 269. Strophonella ampla, dorsal andjprofile^views of brachial^valve; cardinal 

 view and interior of pedicle valve. (After Hall. ) 



