236 Christmas Island, 



between the regular flattened and cylindrical chamberletB of the 

 outer series in Orhitoides. The medium series of chamherlets are 

 somewhat elliptical and alternate with one another. Average 

 breadth \ inch (5 mm.); thickness ~^^ inch (1*56 mm.). Yery 

 common in ]N^o. 924. 



It is most probable that the form figured by Yerbeek and 

 Fennema (torn, cit., j)- 1178, pi. xi, fig. 168) as Lepidocyclina, 

 species d, is comparable with those we have just described. The 

 dimensions of the former are stated to be 2i mm., which is about 

 half the size of our specimens. 



The limestone next in succession is from the middle of Flying 

 Fish Cove at 480 feet, and its reference number is 571. 



It is a hard white limestone with dark spots, and it weathers 

 with a pitted surface and becomes splintery. The rock is partially 

 crystallized, but the organisms, especially the foraminifera, are not 

 thereby obscured. 



The organic contents of this specimen are fragments of Litho- 

 thamnioji, foraminifera {Orhitoides absent), corals, and molluscan 

 shells. 



The foraminifera present in the sections of I^o. 571 are as 

 follows : — 



Miliolina ? undosa (Karrer). 



Quinqueloculina undosa, Karrer, 1867, Sitz. k. Ak. "Wiss. Wien, vol. It, p. 361, 



pi. iii, fig. 3. 

 Miliolina undosa (Karrer), Brady, 1884, Eep. Cliall., rol. ix, p. 176, pl. vi, 



figs. 6-8. 



A transverse section of a flattened and furrowed Miliolina is 

 seen in the slide of JS'o. 571. It appears to agree most nearly 

 with the above species. 



Miliolina agglutinans (d'Orbigny). 



Quinqueloculina agglutinans, d'Orbigny, 1839, Foram. Cuba, p. 168, pl. xii, 



figs. 11-13. 

 Miliolina agglutinans (d'Orb.), Brady, 1884, Eep. Chall., vol. ix, p. 180, 



pl. viii, figs. 6, 7. 



A good transverse section of an arenaceous Miliolina comparable 

 with M. agglutinans occurs in N^o. 571. The species is an 

 inhabitant of shallow-water areas, and is frequent at the present 

 day in coral-sands. 



? Gaudryina pupoides^ d'Orbigny. 



A young individual resembling the above species is found in 

 2^0. 571. 



