~&l 



y£ 



1! 



A 



Rat 1 

 Fig. 1 



A 



m 



^ 



7^ 



^rPs i 



/ 



/ 



m 



s 



X 



Rat 2 

 Fie. 2 



Rat 4 

 Pie. 4 



m 



\ 



\f \ 



\ 



Rat 8 

 Fie. 7 



1 2 3 4 5 6 7 S 9 10 11 12 13 1-1 15 18 17 IS 19 20 21 22 23 24 2.3 20 27 28 29 



Fig. 1(5 



