48 BULLETIN: museum of comparative zoology. 



PLATE 9. 

 Cliff of nearly 300 feet vertical exposure, northern part of Mango. 



PLATE 10. 

 Slope of later andesite, limestone cliffs in the rear, Mango. 



PLATE 11. 



Old gap through which interior basin of Mango was once connected with the sea 

 25 feet above high-water mark, shows also dense vegetation growing on the 

 bare limestones. 



PLATE 12. 



Miniature lagoon on Mango, eroded probably during a period of rest at the 200-foot 

 level ; the old gap (Plate 11) is visible above the pier. 



PLATE 13. 



Undercut and weathered limestone blocks, Mango. Island of Yathata in the 

 distance. 



PLATE 14. 



Weathered block of limestone, Mango. 



PLATE 15. 



Central part of Mango from Mt. Rupert, shows the old gap leading from the inte- 

 rior basin to the sea and the recent andesite outbursts nearly overwhelming 

 the limestone ring. 



PLATE 16. 

 Southwest part of the interior basin of Mango ; view taken from Mt. Ryder. 

 Lettering on diagram facing Plate 16 : 



a. Mt. Rupert, a recent andesite dome. 



b. Block of limestone pushed up by andesite c. 



c. Andesite that has carried up b. 



I. Patches of limestone left or not quite covered by lava or alluvium. 

 /«. Limestone agglomerate in volcanic tuff. 



PLATE 17. 



Central basin of Mango, taken from Mt. Ryder. This view is the continuation of 

 Plate 16. Joins the right of the plate. 

 Lettering on diagram facing Plate 17 : 



a. Andesite hills GOO feet high, beyond this the limestone ring, almost buried 



in its inland development. 



b. Block of limestone partly buried by the flow from Mt. Ryder. 



c. Limestone mass capped by coral reef 240-300 feet above high-water mark. 



d. Volcanic slopes and alluvium downs ; the right-hand member of d shows 



fan-shaped spread of lava as it welled round the cliff c. 



