236 Christmas Island. 



between the regular flattened and cjlindrical chamberlets of the 

 outer scries in Orhitokhs. The medium series of chamberlets are 

 somewhat elliptical and alternate with one another. Average 

 breadth ^ inch (5 mm.); thickness -^g inch (1-56 mm.). Very 

 common in Xo. 924. 



It is most probable that the form figured by Verbeek and 

 Fennema (torn, cit., p. 1178, pi. xi, fig. 168) as Lepidocydina, 

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

 ilimensions of the former are stated to be 2imm., 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- 

 thamnion, foraminifera {Orbitoides absent), corals, and molluscan 

 shells. 



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

 follows : — 



Ililiolina ? undosa (Karrer). 



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



pi. iii, fig. 3. 

 MilioUna uiidom (Karrer), Brady, 1884, Eep. Chall., toI. ix, p. 176, pi. vi, 



figs. 6-8. 



A transverse section of a flattened and furrowed Miliolina is 

 .seen in the slide of l^o. 571. It appears to agree most nearly 

 with the above species. 



Miliolina agglutinans (d'Orbignj'). 



QHinquclocHlbia agghitina)is, d'Orbiguy, 1839, Foram. Cuba, p. 168, pi. xii, 



figs. 11-13. 

 Jliliolina agglutinans (d'Orb.), Brady, 1884, Rep. Chall., vol. ix, p. 180, 



pi. viii, figs. 6, 7. 



A good transverse section of an arenaceous Milioli)ia comparable 

 with Jf. aggluti^mns occurs in Jfo. 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 voung individual resembling the above species is found in 

 1^0. 571. 



