MOOK, VARIATION IN SPIRIFER MUCR0NATU8 



183 



sis-i^ 



ase-9Te 



yXB'io^ 



oQe-^^t 



Jiz-isz 



ojtt-v^ 



y2T-i»7 



00^-911 



yjii-u^/ 



oSMZt 



Stl'lQl 



a. 



2Q 



