44 FOYE. 



1) Islands with limestones eroded partly or wholly from 

 the summits of the andesites. 



Malatta 

 Avea 



Thikombia-i-lau 

 Tuvutha 



2) Islands with volcanic rocks still covered with limestone. 



Vekai Ongea Vatoa 



Fulanga Wangava 



B. Islands whose tops were never covered by limestone. 

 Lakemba 

 Ono-i-lau 

 III. Volcanic islands of the second volcanic period built on plat- 

 forms composed of coralliferous limestone overlying depressed 

 hills of the first volcanic period. 

 Munia 

 Kanathea 

 Ono 



Mbengha 

 For the purposes of discussion in this paper, the islands are 

 grouped according to a simple plan as follows : — 



1) Islands composed of both limestone and volcanic rocks. 



Vanua Mbalavu, Malatta, Thikoml)ia-i-lau, 



Susui, Avea, Tuvutha, 



Lakemba, Ono-i-lau, Kandavu. 



Kambara, 



2) Islands composed of limestone alone. 



Vekai, Ongea, Vatoa. 



F'ulanga, Wangava, 



3) Islands composed of volcanic rocks only. 



Munia 

 Kanathea 

 Ono-i-Kandavu 

 Mbengha 



Group I. Islands Composed of Both Limestone and Volcanic 



Rocks. 



Kxplor'uuj Group, 



Vanua IVIbalavu Susui 



:Malatta A\-ca 



Thikoinbia-i-lau 



