HELICID^E. 



PLATE 45 



.^,,. 



,.,,45*, 



^ 



Q?. 



69 



63 







$^S\ }. / 



64. 



73 



75 





65 



66. 



67 



68 



79 



77 



78 



80 

 ^ 



70 



71 



1 



/ 



>* 



83 



88 



^ f "r-x 



(^ 



/ 



85 



89 



87 



86 



