SPIROPLECTA ROSULA. 159 



BiGENEBiNA NODOSAEiA, Basset, 1885. Acad. Eochelle ; Soc. Sci. Nat. Charente. 



Inf.-Annales de 1884, No. 21, p. 161, 

 and fig. 57 (d'Orbigny's model). 



— — Malagoli, 1887. Atti Soc. Nat. Modena (Eend., ser. 3, 



vol. iii, p. 108, pi. i, figs. 3 and 4. 



— — de Amicis, 1893. Boll. Soc. Geol. Ital., vol. xii, fasc. 3, 



pp. 52, 180, 181. 



— — Ooes, 1894. K. Svensk. Vet.-Akad. Hand!., vol. xxv. 



No. 9, p. 37, pi. vii, figs. 313—323. 



— — Fornasini, 1894. Coll. Soldani, Sagg. Oritt., p. 16. 



Characters. — Initial part of the shell more or less triangular in outline, varying 

 in relative size, and nearly always distinct from the succeeding moniliform series. 

 Test variable in regularity of form, and in the roughness of surface. 



Occurrence. — Most common in shallow waters of the North Atlantic. Fossil 

 in the Middle and Upper Tertiaries. Rare at Sutton. 



Genus 3. — Spiroplecta, Ehrenherg, 1845. 



BericMe Berliner AJcad. Wiss. for 1844, p. 75. Brady, Report ' Challenger,'' 1884, 



pp. 68 a7id 375. 



Textilaeia, Ehrenherg. 



Hetekohelix, Ehrenherg. 



Spihoplecta, Ehrenherg, Parker and Jones, Brady, Balkwill and Wright, Bronn, 



Chapman, Millett, Woodward and Thomas, Halkyard. 

 Texttjlaria (pars), Parker and Jones, Brady, Norman. 



General Characters. — A dimorphous Textilarian form ; early segments piano- 

 spiral, the following biserially alternate; the last not unfrequently uniserial. 

 Test either hyaline or sandy. 



1. Spiroplecta rosula, Ehrenherg, 1854. Plate VII, fig. 25. 



Spiboplecta eosula, Ehrenherg, 1854. Mikrogeologie, Inhalt des Atlas, p. 24, 



pi. xxxii, II, fig. 26. 

 Textulaeia complexa, Brady, 1865. Nat. Hist. Trans. Northumb. Durham, 



vol. i, p. 101, pi. xii, figs. 6 a, h; and 

 Rep. ' Chall.,' 1884, p. 377, foot-note. 

 Spieoplecta demeesa, Ehrh., 1873. Abhandl. Berliner Akad. Wiss. for 1872, 



p. 247, pi. vii, fig. 26. 



— NANA, Ehrh., 1873. Ibid., p. 247, pi. v, fig. 17. 



— EOSULA, Egger, 1893. Abbandl. k. Bayer. Ak.-Wiss., vol. xviii, 



Abth. II, p. 274, pi. vii, figs. 13, 14. 



