Fig. 6 



/ 



/\ 



X 



N 



£k 





Rat 10 

 Fig. 9 



Rat 12 

 Pie. 11 



: , , , f , i 



m 



f 



Rat 13 

 Fig. 12 



fi 



Rat 14 

 Fig. 13 



1 2 3 1 S 6 7 8 '.1 10 11 12 13 14 15 1G 17 IS 19 20 21 22 23 21 25 20 27 28 



Fig. 17 



