BRITISH OAK GALLS 161 



The extraordinary manner in which some galls of Cynips Kollari grow in 

 geometrical, and in peculiarly-arranged groiips, is exemplified in 



PLATE XXXVII. 



(jROUP : 

 1, 2. Three's. 3 to 8. Four's. 9, 10, 11. Five's. 



12. Two two's coalescent, one single. 



13. Two coalescent, three single. 



14. Two coalescent, four single. 



Fourteen groups comprising sixty-one galls. 



The conglomerate clusters they form are also remarkable ; a few are shown on 



PLATE XXXVIII. 



Cluster : 



1. Two galls coalescent and seventeen single. 



2. Two two's coalescent, three coalescent, and seven single. 



3. Three two's coalescent and four single. 



4. Three two's coalescent and eleven single. 



5. Twelve single. 



6. Nine single. 



7. Three coalescent and eleven single. 



8. Eleven single. 



Eight clusters comprising one hvmdred and six galls. 



A few galls are obscured by those nearest to the observer. 



11 



