FORAMINIFERA IN THE RAISED REEFS OF FIJI. 361 



PAUMOTUS GROUP. Makatea (Mbtia or Aurora I.). An ele- 

 vated mass of coraliferous limestone with a comparatively narrow shore 

 platform cut from the base of the cliffs. It is the highest member of the 

 group, reaching 230 ft. 



2d terrace. No organisms. 



Basin, 150 ft.— 175 ft. Lithothamnion and Mollusca, the former 

 abundant. 



Foraminifera : Polytrema miniaceum Pallas, sp. 



Polytrema plaxum Carter. The two species of 

 Polytrema are encrusting forms, the P. planum is 

 here growing on P. miniaceum, and the latter on 

 Lithothamnion. The three organisms make up the 

 bulk of the rock. 

 Carpentaria. 

 Gypsina. 



1 Amphistegina, one. specimen, which may possibly be 

 Heterostegina. 

 3d terrace, 200 ft. A coral rock which has undergone alteration. 



Niau. — This island, like the others of the group, has been greatly de- 

 nuded. The Tertiary limestones do not occur at a higher level than 

 about 16 ft. It is the only member of the group which possesses a 

 lagoon shut off from the sea. 



20 ft., half-way across the rim. A coral rock, a fragment, apparently 

 of a mollusc, occurs, but alteration has rendered it indistinct. 



THE LADRONES. Guam. — The northern half consists of raised 

 limestones, which form vertical cliffs on the eastern side, 109 to 300 ft. 

 high. In the southern half, volcanic rocks, in places, burst through the 

 limestones. This part of the island reaches 1000 ft. 



Mt. Makawia, near the summit. A fragmentary rock made up of or- 

 ganisms broken to a uniform small size. They comprise Lithothamnion, 

 Polyzoa, and 



Foraminifera : Miliolina, fairly numerous. 

 Textularia. 



Truncatulina, numerous specimens. 

 1 Spirillina, one doubtful specimen. 

 1 Carpenteria, numerous, rather indefinite 



fragments. 

 Gypsina. 

 Polytrema. 



