352 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



Amphistegina lessonii d'Orb. 



Polytrema MiNiAGEUM Pallas, sp. intergrown with 

 Lithothamnion. 



MlLIOLINA. 



Textularia. 



1 Gaudrtina. 



320 ft. A coral rock with Lithothamnion. 



Foraminifera : 1 Gypsina inhosrens Schultze, sp. A long wander- 

 ing form which may possibly be a Polytrema. 

 350 ft. No organisms are recognizable with certainty. 

 370 ft. Fragments of echinoderms are abundant; also Lithothamnion ; 

 Gasteropoda are present. The rock is fragmentary and the organisms 

 are for the most part in a fresh condition. 



Foraminifera : Gypsina inhcerens Schultze, sp. 



Carpenteria ; numerous fragments. 



? DlSCORBINA. 



316, No. B, ht. 400 ft. The organisms are very indistinct in conse- 

 quence of doloraitization. As usual Lithothamnion has proved most 

 resistant to alteration. Echinoderm fragments, corals, and Lithotham- 

 nion are recognizable besides the following 

 Foraminifera : Amphistegina lessonii, d'Orb. 

 Polytrema. 

 1 Heterostegina. Small fragments probably belong 



here. 

 1 Carpenteria. A fragment. 



Ngillingillah. The island is apparently composed of coral rock 

 500 ft. thick, but Mr. Andrews finds that the island consists of bedded 

 limestone, covered by coral rock and reef-debris at most 200 ft. thick. 

 There are signs of three, or possibly four, periods of upheaval. 



318, No. B, ht. 25 ft. The section consists of dolomitized coral, the 

 crevices of which are filled with a black mud composed of organic frag- 

 ments amongst which Lithothamnion, echinoderms, and a rotaline foram- 

 inifer are recognizable. Tunicate spicules are also probably present. 



308, No. 43, ht. 215 ft. The rock has undergone dolomitization and 

 the only organisms recognizable with certainty are corals. 



301, No. 77, ht. 475 ft. The slide shows Lithothamnion and Poly- 

 trema growing in alternating layers. Other organisms have been obliter- 

 ated by dolomitization. . 



Foraminifera : Polytrema planum Carter. 



