Plate XVIII. 



^ ' 

 fc .~. 



-- 



s , : 



m 



'^M$ 



*m 



'-^"x 



>:&^*-: 



""Si' 



. 

 gtfS 



.3|^ 4. : i 



.. S i ^- 



si?- 



u^ili 



^.'.i:->;:'. 



m 



mv2: 



X =SS/ 





v-^ 



A.T.H 



A TYPICAL GROUP OF FO ! 1F.ERA I to 11 . 



Edwin Wilson, Cambridge 



