156 



PKOCEEDINGS OF THE AMERICAN ACADEMY. 



APPEN 



Correlation Surface : Transverse 

 FiETH OF Forth, 



Transverse diameter in tenths of millimetres. 



o 



CO 

 IN 

 O 

 41 

 t- 

 <z> 



67 58 61 62 63 64 65 66 67 68 



70 71 72 73 74 75 76 77 78 79 80 81182 83 84 85 86 87 



II 



a 

 ••a 



45 

 46 

 47 

 48 

 49 

 50 

 51 

 52 

 53 

 54 

 56 

 56 

 57 

 58 

 59 

 60 

 61 

 62 

 63 

 64 

 65 

 66 

 67 

 68 

 69 

 70 

 71 

 72 

 73 

 74 

 75 

 76 

 7 

 78 

 79 

 80 



2 4 3 3 4 3 4 1 2 3 5 4 2 4 10 4 9 8 8 16 13 16 16 14 16 8 17 16 26 



