Recent and Fossil Foraminifera. 689 



Judging from our own specimen, we do not think that Terquem 

 is correct in stating that the shell is built up of two sets of cham- 

 bers. If his statement were correct, the specimens could not be 

 referred to the genus in which he places them, but would be more 

 correctly assigned to Bulimina — indeed, his drawings, especially 

 figs. 13 and 14, are not unlike Bulimina convoluta Williamson ; 

 bat it appears to us that the constrictions and incisions (slits) to 

 which he refers in his description are not lines of demarcation 

 between two separate series of chambers, but merely subsidiary 

 marginal apertures, such as are found in certain species of Pulvi- 

 iiulina (cf. P. dcgans d'Orbigny), and for which Terquem himself 

 proposed the sub-genus Epistomina. Our specimen, as will be seen 

 from the drawing, approaches and is almost identical with Terquem' s 

 tit; 12, and there is very little doubt that it has been derived from 

 a similar Eocene formation. The shell presents a somewhat worn 

 and whitish appearance, such as is characteristic of the Paris 

 Eocene beds. 



Rotalia Lamarck. 



200. Botalia beccarii Linne sp. 



Nautilus beccarii Linne, 1767, Syst. Nat., 12th ed. p. 1162; 1788, ibid. 13th 



(Gmelin's) ed., p. 3370, No. 4. 

 Rotalia (Turbinidaria) beccarii (Linne) d'Orbigny, 1826, Ann. Sci. Nat., vol. 



vii. p 275, No. 42 ; Module No. 74. 

 Rotalina beccarii (Linne) Williamson, 1858, Eecent Foram. Gt. Britain, 



p. 48, pi. iv. figs. 90-2. 

 Rotalia beccarii (Linne) Brady, 1884, Foram. ' Challenger/ p. 704, pi. cvii. 



figs. 2, 3. 

 Ditto. (Linne) Brady, 1887, Synopsis British Eecent Foraminifera. 

 Ditto. (Linne) Earland, 1905, Journ. Quekett. Micr. Club, ser. 2, vol. ix. 



No. 57, p. 228. 

 Ditto. (Linne) Sidebottom, 1909, Mem. Manchester Lit. and Phil. Soc, vol. 



liii. No. 21, p. 10, pi. iv. fig. 6. 



Very common, both recent and fossil ; the latter derived from 

 many sources, ranging from the Bracklesham clays to recent. 

 Among the recent specimens, besides the typical B. beccarii, the 

 smooth thin-shelled variety recorded by Earland (suprd) from 

 Bognor, also occurs. Among the fossils are one or two of the tuber- 

 culate variety figured by Sidebottom (suprd), which, it appears from 

 his paper, has also been found by Millett in the Pliocene beds 

 of St. Erth. Such specimens are abundant in some of the Italian 

 Tertiaries. 



201. Rotalia (Gyroidina) orbicularis d'Orbigny. 



Rotalia (Gyroidina) orbicularis d'Orbigny, 1826, Ann. Sci. Nat., vol. vii. 



p. 278, No. 1 ; Modele No. 13. 

 Rotalia orbicularis (d'Orbigny) Brady, 1864, Trans. Linn. Soc. Lond., vol. 



xxiv. p. 470, pi. xlviii. fig. 16. 



