36 



W. A. SANDS 



ANTERIOR 



14- 

 3- 



8— I 

 4 — 

 1 — 

 5— 



12- 

 16- 



9- 

 15- 

 13- 



2- 

 10- 



POSTERIOR 



Single linkage 



21 



14- 

 3- 

 4- 

 1- 



16- 

 6- 

 8- 

 11- 



15- 



Median sorting 



22 



10- 



1- 



3- 

 4- 

 5- 

 14- 

 15- 

 16- 

 6- 



(10- 

 11- 

 2- 



Hypothetical phylogeny 



23 



13- 



1 ACIDNOTERMES 



2 AMALOTERMES 



3 ASTALOTERMES 



4 ADYNATOTERMES 



5 ASTRATOTERMES 



6 ALYSCOTERMES 



7 AGANOTERMES 



8 ACHOLOTERMES 



9 AMICOTERMES 



10 APAGOTERMES 



11 ATEUCHOTERMES 



12 ANAOROTERMES 



13 ASAGAROTERMES 



14 ANENTEOTERMES 



15 ADERITOTERMES 



16 ADAIPHROTERMES 



Figs 18-23. J 8, numbering of enteric valve cushion positions that vary independently; 

 19, asymmetry of enteric valve resulting from development of positions 3 & 4; 20, 

 asymmetry due to development of position 1; 21-23, comparison of dendrograms of 

 phenetic relationships between genera based on single linkage clustering (21) and median 

 sorting (22) with a hypothetical phylogeny based on conventional criteria (23). 



