^38 Christmas Island. 



Planorhidina mediterranensis^ d'Orb. 



Planorhdina larvata, P. & J. 



(Eoth the above forms of Planorhulina are intcrgrown in this 

 specimen with a massive LWiothamnion.) 



Carpenteria lithothamnica'i, TJhlig. Ereqnent. 



Rupertia, sp. Basal segments adherent to a floor consisting of 

 Lithothamnion, which coats the surface of the basalt. 



Rotalia papulosa^ var. compressiuscula, Brady. Very common. 



Gypsina globulus (Eeuss). Occasional. 



Amphisfegina lessonii, d'Orbigny. Frequent. 



Ileterostegina depressa, d'Orbigny. Several fragments. 



Towards the side of the Cove whence the succession of rock 

 specimens now being described were taken, two specimens were 

 collected on either side of a basaltic mass, numbered 229 and 

 220 respectively. 



Taking the specimen I^o. 229 first, it is seen to have many 

 points in common with the specimen !N'o. 571 noticed above, 

 and although it differs from that rock in some slight degree of 

 minute structure, yet they contain so much in common and are in 

 themselves different from those rocks immediately below and above 

 that they are presumabl}^ different parts of the same bed. 



1^0. 229 is a very hard, pale cream-coloured or whitish limestone. 

 Thin sections of the rock show it to be composed of Lithothamnion 

 in some quantity of the laminar and investing type, many fora- 

 minifera (but no Orhitoides present), echinoderm plates, and polyzoa. 



The foraminifera in No. 229 are as follows : — 



Textularia rugosa (Eeuss). 

 Several typical specimens are seen in this section. 



Planorhulina acervalis?, Brady. 



The specimens referred doubtfully to the above species are 

 adherent and forming a depressed layer, with thin-walled chambers. 

 They are fairly common in the section. 



Carpenteria, sp. near C. monticidaris, Carter. 



Mostly fragmentary, but there is one example with a perfectly 

 enclosed chamber - cavity. The separate pieces of the test are 

 numerous in this section. 



PulvinuUna repanda (Fichtel & Moll). 

 One good specimen was noticed in the slide of IN'o. 229. 



