FORAMINIFERA OF THE ATLANTIC OCEAN. 5 



SPIROPLECTA FUSCA Earland. 



Plate 4, fig. 4. 



Spiropleda fusca Earland, Journ. Quekett Micr. Club, ser. 2, vol. 9, 1905, p. 

 204, pi. 12, fifjs. 1-3. — Heron-Allen and Earland, Journ. Roy. Micr. 

 See, 1909, p. 331; Trans. Linn. Soc. London, vol. 11, ser. 2, Zoology, 1912, 

 p. 232. 



This species described by Earland from the sands at Bognor has 

 been recorded also from Selsey Bill and from the coast of Scotland. 

 It is not known except about the British Isles. 



SPIROPLECTA WRIGHTII Sllvcstri. 



Plate 4, figs. 5-8. 



Spiroplecta sagittula (Defrance) Wright, Proc. Roy. Irish Acad., ser. 3, vol. 1, 



1891, p. 471; Irish Nat., vol. 11, 1902, p. 211, pi. 3. 

 Spiroplecta nrightii Silvestri, Atti Accad. Rom. Nuovi Lincei, Ann. 50, 1903, 



pp. 1-5 (woodcuts). — Heron-Allen and Earland, Proc. Roy. Irish Acad., 



voL 31, pt. 64, 1913, p. 64. 



The Spiroplectine forms often referred to Textularia sagittula 

 have been named by Silvestri Spiroplecta wrightii. Such forms seem 

 to be common off the coast of the British Isles but are not known 

 from the •western Atlantic. 



Subfamily 2. Textulariinae. 



Test typically biserial, wholly or in part, the early portion in the 

 microspheric form often with a few coiled chambers, followed by the 

 biserial chambers; later chambers variously modified in the different 

 genera, uniserial, broadly extended, etc.; wall either arenaceous or 

 calcareous and hyaline, perforate; aperture single, or in a few cases, 

 many present in a single chamber. 



This subfamily includes those forms which are essentially biserial 

 ;n their development, not having reached the triserial stage anywhere 

 in their stages of development. The stages in the simpler genera are 

 like those of Spiroplecta, except in duration, the biserial condition 

 being taken on much earlier than in that genus. Variously modified 

 forms occur as in the uniserial arrangement in Bigenerina, the broadly 

 flaring later growth of Pavonina, and the peculiarly modified aperture 

 in Pleurosiomella. 



Genus TEXTULARIA Defrance, 1824. 



Textularia Defrance (type, T. sagittula Defrancej, Diet, des Sci. Nat., vol. 32, 

 1824, p. 177; vol. 53, 1828, p. 344; Atlas Conch., pi. 13, fig. 5.— Chapman, 

 The Foraminifera, 1902, p. 165.— Cushman, Bull. 71, U. S. Nat. Mas., pt. 2, 

 1911, p. 5. 



Texiilana Ehrexberg, Abh. preuss. Akad. Wiss. Berlin, 1839, p. 135. 



Gramnwstomura Ehrenberq (part), Abh. preuss. Akad. Wiss. Berlin, 1839, 

 p. 129. 



Plecanium Reuss, Sitz. Akad. WLsa. Wien, vol. 44, 1861 (1862), p. 383. 



