SPIROLOCULINA NITIDA. 113 



Spiroloculina sp. indet., HantJcen, 1875. Mitth. Jabrb. k. Ung. Geol. Anstalt, 



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



— ROTUNDA, Terquem, 1878. Mem. Soc. Greol. Pr., ser. 3, vol. i, 



p. 54, pi. X, fig. 10. 



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



— AMPLA, Terquem, 1881. Plao:e Dunkerque, fase. 3, p. 132, pi. xvii, 



fig. 10. 



— DESESTOErM, Schwager, 1883. Palseontographica, vol. xxx, p. 84, 



pi. xxiv, fig. 2. {^Sp. rotunda 

 with imperfect keel.) 



— PROBOsciDEA, Schimger, 1883. Ibid., fig. 3. (Long oval rotunda, 



with very slight keel). 

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

 figs. 5, 6 (variety). 



— ROTUNDATA, Fornasini, 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, 1890. Mem. Acad. Sci. Cracow 



(Pamiet. Wydz. Ill, Akad. 

 TJmiej. Krak.), vol. xvii, 

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



— MINIMA, Wisniowski, 1890. Ibid., p. 9, pi. viii, fig. 7. 



— iiiwici\.is, Wisniowski, I'dQO. Ibid., p. 10, pi. viii, fig. 8. 



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



pi. vi, fig. 1. 



— TENUISEPTATA, Egger, 1893. Abhandl. k. Bayer. Akad. Wiss., 



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

 pi. i, figs. 48, 49. 



— (oPHTiiALMiDiUii ?) coMPLAUATA, Egger, 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 " nit Ida," d'Orb., is chosen 

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

 cannot identify. 



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

 oval, Spiroloculiue 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 



