AND INHERITANCE IN PEDIASTRUM. 

 TABLE IV.— Continued. 



405 



of selected individuals is made possible with the data given below 

 in Table IV. The lettering of the angles, etc., as noted above, is 

 given in Fig. 35 which is taken from my earlier paper ('16, Fig. 16). 

 The comparison of the values of the included angles made by 

 the intersection of the cell walls in two such types as P. Boryanum 

 and P. asperum brings out very clearly the significance of the cell 

 form as related to the symmetry of such groups. As noted in P. 

 Boryanum the angles fluctuate widely, while in P. asperum their 

 variations are almost entirely within the limits of error in measuring 

 them. 



PROC. AMER. PHIL. SOC. VOL LVII. BB, AUG. 20, I9l{ 



