HELICID^E. 



PLATE 6 



4-0 



w 1 



43 



44, 



4-P 



34- 



36 37 



50 



51 



52 



63 



55 



57 



58 



53 



60 



61 



65 



66 



71 



72 



67 



73 



78 



86 



84- 



79 



80 



