FORAMINIFERA IN THE RAISED REEFS OF FIJI. 359 



Foraminifera : Orbitolites. 

 Globigerina. 

 Polytrema, encrusting. 

 Also rotaliue forms. 



TONGA ISLANDS (FRIENDLY ISLANDS). Tonga Tabu.— 

 This is the largest of the Tonga group, and is twenty-two miles long. 

 It is crescentic in shape, the convex side looking south and terminating 

 in low cliffs. The concave side to the north is low-lying, and its shore- 

 line represents the border of the old lagoon. The island is entirely 

 calcareous. (Cf. J. J. Lister.) 



Mt. Zion Hill, 50 ft. Contains echinoderm fragments, Gasteropoda 

 and Polyzoa. 



Foraminifera : Globigerina. 

 Gaudryina. 



1 Heterostegina (or 1 Amphistegina). 

 Carpenteria. 



Polytrema mintaceum Pallas, sp. 

 Also rotaliue forms. 



Eua. Eua is composed of two ridges running north and south, with 

 a valley eroded between them. On the eastern side there is a limestone 

 cliff rising in places to 1000 ft., with terraces on the projecting points. 

 They are three in number in the north, and five in the south. The 

 western ridge, which is also of limestone, is lower, and shows three ter- 

 races. The island is not an atoll, but an eroded platform (cf. A. Agassiz). 

 2d terrace, 120 ft. A few almost opaque fragments of Lithothamnion 

 and the 



Foraminifera : Gypsina. 



Carpenteria. 



Amphisteginia lessonii d'Orb, very abundant. 

 Miliolina, a number of specimens. 

 Also a broad, short, textularian form. 

 3d terrace, 250 ft. Halimeda, Lithothamnion, Gasteropoda. None 

 of these are abundant. 



Foraminifera : Polytrema. 

 Miliolina. 

 Carpenteria. 

 Inner Valley, 600 ft. Echinoderm fragments abundant. Lithotham- 

 nion and Polyzoa are present. 



