FOEAMINIFEEA OF THE KEEIMBA ARCHIPELAGO. 687 



final chambers were furnished with a spreading carina. At Stn. 3 one individual 

 only was found of the high conical type ; this conical type occurs of a comparatively 

 large size at Stn. 11, where the depressed form was also found to be large and well 

 developed. Specimens exhibiting the markedly non-septate initial portion which 

 led Ehumbler to transfer the species to Sinrillina (R. 1905, NST. p. 85) were 

 found, but none with the rotaliue commencement noted by Chapman {ut supra). 



Cymbalopora Hagenow. 



335. Cymbalopora poeyi (d'Orbigny). 



Eotalia squammosa d'Orbigny, 1826, TMC. p. 272. no. 8. 



Roscdina poeyi d'Orbigny, 1839, FC. p. 92, pi. lii. figs. 18-20. R. squammosa, p. 91, pi. iii. 



figs. 12-14. 

 Cymbalopora poeyi Carpenter, Parker, & Jones, 1862, IF. p. 215, pi. xiii. figs. 10-12. 



„ Mcibius, 1880, F.M. p. 97, pi. x. figs. 1-5. 

 Discorbina poeyi Goes, 1882, RRCS. p. 107, pi. viii. figs. 264, 265. 

 Cymbalopora poeyi Brady, 1884, FC. p. 636, pi. cii. fig. 13. 



„ Egger, 1893, PG. p. 381, pi. xviii. figs. 51, 52. 



„ Chapman, 1900, FLF. p. 189. 



„ Ehumbler, 1906, FLC. p. 71, pi. v. fig. 59. 



16 Stations. 



C. poeyi in one or other of its numerous forms is one of the most abundant species 

 throughout the area, as, indeed, in all shallow-water tropical gatherings. The 

 -specimens may be roughly divided into high-domed and low-domed types, which 

 usually occur together, though in varying proportions. As regards the high-domed 

 type, very few specimens were obtained of the large and typical foim described and 

 figured by d'Orbigny as Botalia squammosa, but the less convex C. poeiji is abundant 

 at most of the Stns. The specimens are, however, as a rule, smaller than the 

 individuals of the depressed type figured by Brady as C. poeyi var. (FC. pi. cii. fig. 14), 

 some of which attain very large proportions. A smaller form, characterized by a 

 high-domed test with rounded apex and having a well-marked rotaline initial portion, 

 of the type of Discorbina concinna, followed by numerous acervuline chambers of a 

 small and regular form, occurs at many of the Stns. This is indistinguishable from 

 the initial portion of C. milletti, and is probably but a stage in the life-history of 

 that form. The colour of the specimens of C. poeyi is very variable, normally of a 

 deep brown tint, especially as regards the initial chambers, it is at some Stns. (notably 

 Stn. 4) quite colourless. The number of lobes on the inferior surface does not appear 

 to have any specific significance ; they vary in specimens otherwise indistinguishable, 

 from four (the usual number in the Kerimba types), to as many as seven or eight. 

 Perhaps the majority of specimens, especially of the high-domed variety, have the 

 four lobulations. Attached specimens are of rare occurrence, but even the small 

 high-domed form (akin to C. milletti) has been seen (Stn. 12) in this condition. 



VOL. XX. — PART XVII. No. 19. — November, 1915. 5 D . 



