O. A. Meuritt Hawkrs 



267 



FKiURE 4. 



Slmwhiy three family ijroups ( Trees A, B, C) in which there is persistence 



of tile L toe-type. 



Tree A. 



9 = rf 



2. 9 

 L 



3. 



4. 



9 = (? 

 L I L 



9 = 6 



L L 



9 



L 



6 

 L 



9 



L 



9 



L 



Four generations of L type. 

 Tree B. 





9 



L 





I 



9 



L 



6 



L 



9 



L 





<? = 9 



L L 



9 

 L 



Two generations of L type with tlio appearance of a B (one of tlie 

 exceptions mentioned in text). 



1. 



A 



I 



9 



L 



I 



i 



L 



6 



L 



Tree C. 



6 = 9 



I r ' 



! I 



9 i 



^ 1^ 



L 



6 



L 



$ = 9 



L I B 



-H 



I 



9 

 L 



6 

 L 



6 

 L 



Three generations with persistence and dominance of i, but the appearance 



of an A. 



