Recent and Fossil Foraminifera. 31? 



the North Sea, we are no longer able to agree with Balkwill, Millett 

 and Brady in the identification of B. laevigata with B. textilarioides. 

 Williamson's species, which has a peculiarly characteristic initial 

 portion and an entire absence of that roughened granular deposit in 

 the neighbourhood of the sutures which is so characteristic of the 

 type commonly referred to B. textilarioides Reuss, exists side by side 

 with Ueuss' type in many of Earlaud's North Sea dredgings, but we 

 have failed to trace any specimens showing characters intermediate 

 between the two species. 



Our Selsey gatherings afford abundant instances of Eeuss' type 

 as figured by Brady, but none resembling Williamson's species, and 

 we therefore withdraw B. laevigata from the list and substitute 

 B. textilarioides. We have figured both forms in order to show the 

 differences to which we refer. The Selsey specimens are mostly 

 fossils, but there are several which to all appearance are of recent 

 origin. 



341. Bolivina tortuosu Brady. 



(Plate X. figs. 3, 4.) 



Bolivina tortuosa Brady, 1881, Quart. Journ. Micr. Sci., vol. xxi. N.S. p. 57. 

 Ditto. (Brady) Brady, 1884, Foram. ' Challenger,' p. 420, pi. lii. figs. 31-34. 

 Ditto. (Brady) Egger, 1893, Abhandl. k.bayer. Akad. Wiss., CI. II. vol. xviii. 



p. 298, pi. viii. figs. 43, 44. 

 Ditto. (Brady) Millett, 1900, Malay Foraminifera, p. 543. 

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



No. 57, p. 20^. 



A few good and typical recent specimens. 



The species, which is of fairly frequent occurrence in warm seas, 

 was first recorded in Britain by Earland (supra) from the neigh- 

 bouring locality of Bognor. It does not appear to have been met 

 with otherwise in Great Britain. 



248. Ellipsoidella pleurostomdloides (H.-A. and E.). 



Since the publication of our description and figures of Ellip- 

 soidella, Mr. F. W. Millett has drawn our attention to two papers 

 by Sig. Alfredo Silvestri,* in which that eminent and industrious 

 rhizopodist has already adumbrated the presence of the peculiar 

 internal tube or siphon (which characterizes our genus), in con- 

 nexion with other allied forms ; cf. Pleurostomella, Bulimina, Glan- 

 dulina, Polymorphina, etc. Dr. Silvestri's papers, to which we have 

 devoted considerable and careful attention, are extremely interest- 

 ins and suggestive, but a good deal of the matter seems to be of 

 a theoretical nature. It appears to us somewhat doubtful whether 

 his conclusions were arrived at as the result of a sufficiently ex- 



» 1. A. Silvestri, Atti R. Accad. Sci. di Torino, vol. xxxviii. 1902-3, p. 206 

 "Alcune osservazioni sui Protozoi fossili piemontesi." 2. Mem, Pontif. Accad. 

 Rom. dei Nuovi Lincei, vol. xxii. p. 235. " Richerche strutturali su alcune forme 

 dei Trubi di Bonfornello (Palermo)." Rome, 1904. 



June 21st, 1911 y 



