228 Christmas Island. 



This form is here represented by numerous examples cut in 

 various directions ; thus a good idea may be gathered of the actual 

 shape of the test. 



The shell-wall is fairly thin and simple, and the test is fiat on 

 the upper, and evenly inflated on the inferior, face. In the 

 regularity of the chambers this form agrees very closety with 

 the variety figured by d'Orbigny from the Miocene of Vienna 

 under the name of Truncatulina boueana,^ which form has been 

 included in the synonymy of T. lobatula by H. B. Brady. The 

 chances that these sections represent a Pulvinulina are small, on 

 account of the comparative thinness and simplicity of the outer 

 walls of the chambers, although the two genera have isomorphous 

 forms. 



Pulvinulina repanda (Fichtel & Moll). (PI. XX, Pig. 1.) 



NaHtxlns repandus, Fichtel & Moll, 1798, Test, micr., p. 35, pi. iii, figs. a-d. 

 Rotalia repanda (F. & M.), Parker & Jones, 1860, Ann. Mag. Nat. Hist., 



ser. Ill, vol. T, p. 175, No. 25. 

 Fukinula repanda (F. & M.), P. & J., in Carpenter, 1862, Introd. Foram., 



p. 210. 

 Placentula repanda (F. & M.), Berthelin, 1878, Foram. Bourgneuf et Pornichet, 



p. 41, No. 68. 

 Pulvinulina repanda (F. tS: M.), Terrigi, 1880, Atti dell' Accad. Pontif., 



ann. xxxiii, p. 206, pi. iii, fig. 61 ; Brady, 1884, Kep. Cliall., 



vol. ix, p. 684, pi. civ, figs. 18<r-c. 



Several good transverse and vertical sections of a pulvinuline 

 form, with a thick test, and with characteristically coarse pores, 

 have been noted in the yellow limestone (jS"©. 2) [see photograph, 

 Fig. 1]. The average diameter of the test is aV inch. These 

 examples compare most closely with the above species, which is 

 verj' frequent and large in the coral-sands at the present time. To 

 aid the comparison, a section of a recent specimen has been made 

 and examined, and bears out this conclusion. 



Rotalia scJiroeteriana, Parker & Jones. 



R. sehrocieriana (Parker & Jones MS.), Carpenter, 1862, lutrod. Foram., 



p. 213, pi. xiii, figs. 7-9. 

 S. tuberosa, Karrer, 1867, Sitzungsb. k. Akad. "Wiss. Wien, vol. Iv, p. 349, 



pi. i, fig. 4. 

 £. schroeteriana, Parker & Jones, Brady, 1884, Eep. ChalL, vol. ix, p. 707, 



pi. 105, figs. la-c. 



Amongst the rotaline sections in specimen No. 2 there are some 

 strongly developed examples, coarsely porous, sub- orbicular, and 

 with the surface irregularly relieved with rounded prominences. 

 These specimens appear to agree most nearly with the above 

 species. R. schroeteriana has been described from Miocene deposits, 

 and is also found li\'ing in the Eastern Archipelago. 



1 Foram. Foss. Yienne, 1846, p. 169, pi. ix, figs. 24-26. 



