SPIROLOCULINA NITIDA. 113 



Spiroloculina sp. indet., Hanthen, 1875. Mitth. Jahrb. k. Ung. Geol. Anstalt, 



vol. iv, p. 20, pi. xiii, fig. 1. 

 rotunda, Terquem, 1878. Mem. Soc. Geol. Fr., ser. 3, vol. i, 



p. 54, pi. x, fig. 10. 

 — interrupta, Terquem, 1878. Ibid., p. 53, pi. x, fig. 9. 



ampla, Terquem, 1881. Plage Dunkerque, fasc. 3, p. 132, pi. xvii, 



fig. 10. 

 desertordm, Schwager, 1883. Palaeontographica, vol. xxx, p. 84, 



pi. xxiv, fig. 2. (Sp. rotunda 

 with imperfect keel.) 

 proboscidea, Schivager, 1883. Ibid., fig. 3. (Long oval rotunda, 



with very slight keel). 

 tentjiseptata, Brady, 1884. Eept. ' Challenger,' p. 153, pi. x, 



figs. 5, 6 (variety). 

 rotundata, Fornasmi, 1886. Boll. Soc. Geol. Ital.,vol. v, p. 220, 



No. 294. 

 nitida, Fornasini, 1886. Ibid., vol. v. p. 221, No. 296 (with 



synonyms). 

 Michalskii, Wisniowski, 1S90. Mem. Acad. Sci. Cracow 



(Pamiet. Wydz. Ill, Akad. 

 Umiej. Krak.), vol. xvii, 

 p. 8, pi. viii, fig. 6. 

 minima, Wisnioioski, 1890. Ibid., p. 9, pi. viii, fig. 7. 

 difficilis, Wisniowski, 1890. Ibid., p. 10, pi. viii, fig. 8. 

 NiTiDA. Mariani, 1891. Boll. Soc. Geol. Ital., vol. x, p. 171, 



pi. vi, fig. 1. 

 tenuiseptata, Fgger, 1893. Abhandl. k. Bayer. Akad. Wiss., 



cl. ii, vol. xviii, pp. 218 and 223, 

 pi. i, figs. 48, 49. 

 (ophthalmidium ?) complanata, Fgger, 1893. Ibid., p. 225, 



pi. iii, figs. 7, 8. 



Characters. — Chambers convex ; shell more or less biconcave ; in some cases 

 limbate. 



The relationship of this form to Spiroloculina planulata has been explained 

 above at p. 104; and reasons are there given why " niiida" d'Orb., is chosen 

 instead of " turgidula" given by Lamarck to a similar variety, but which we 

 cannot identify. 



In the specimen before us (PI. V, fig. 3) we have a boldly elliptical, or broad- 

 oval, Spiroloculine shell with convex chambers and a distinctly limbate string- 

 course or keel along the outer edge of the last two. 



„ It nearly corresponds with pi. x, figs. 1 and 2, of Brady's Spiroloculina 

 limbata, var., pp. 150, 151, Rep. ' Challenger,' 1884. This is a thin subcircular 

 form, in which all the successive outer or over-riding chambers appear to have 

 had the limbate edge. Hence Dr. Brady associated his specimen with Bornemann's 



