The foraminifera: an introduction to the study of the protozoa . spect, X 6 ; rt, transverse section, x 15. B, h. Schwagerina princeijs, Ehrenberg sp. (after Brady) : A, ex- ternal view, X lA ; h, transverse section of test, x 8. C, c. Nonioniitn iimbiUcdtttla, Montagu sp. (after Parker and Jones): C, lateral aspect ; c, oral aspect, x 30. D. Polystomella macella, Fichtel and Moll sp. (after Brady), x 60. E, e. Faujasina carinata, DOrbigny : E, inferior aspect (convexsiirface) ; <?, peripheral aspect. F,/. Archcediscus Karieri, Brady: F, periphero-lateral aspect; /,transverse section of tes
The foraminifera: an introduction to the study of the protozoa . spect, X 6 ; rt, transverse section, x 15. B, h. Schwagerina princeijs, Ehrenberg sp. (after Brady) : A, ex- ternal view, X lA ; h, transverse section of test, x 8. C, c. Nonioniitn iimbiUcdtttla, Montagu sp. (after Parker and Jones): C, lateral aspect ; c, oral aspect, x 30. D. Polystomella macella, Fichtel and Moll sp. (after Brady), x 60. E, e. Faujasina carinata, DOrbigny : E, inferior aspect (convexsiirface) ; <?, peripheral aspect. F,/. Archcediscus Karieri, Brady: F, periphero-lateral aspect; /,transverse section of test, x 20. G, g, g. Amphistegina Lessonii, DOrbigny : G, inferior lateral aspect,showing the astral lobes ; g, superior lateral aspect, withgranulations near oral region, g, peripheral aspect. (AfterParker, Jones, and Brady.) x 55. H, h. Operculina ammonoides, Grono^ins sp. : H, lateral aspect ; h,peripheral aspect, x 50. I, *, i. Heterostegina depressa, DOrbigny : I, lateral aspect of a full-grown shell; i, peripheral aspect, x 7; i\ young shell,X 25. PLATE Family X. NUMMULINID^. THE FAMILY 243 marginal caiials conspicuously developed. LoiuerCretaceous to JRecent. Example.—0. ammonoides^ Gronovius sp.(Nautilus), Zooph. Gron. 1781, p. 282, No. 1220,and p. V. A small complanate form with comparatively fewchambers and with limbate or thickened sutures. Itis found at the present day in fairly shallow to JRecent. (Plate 13, figs. H, //.) Genus Heterostegina, DOebigny. Test resembling Operculina in general contour;chambers long and narrow, and divided into chamber-lets ; aperture a row of pores on the outer septal to Becent. Example.—H. clepressa, DOrbigny, Ann. vol. vii. 1826, p. 305, pi. xvii. figs. 5-7 ; Modele, No. 99. The present species is the type of the genus, andthe many variations which have been describedas species differ in little from this form. Theshell presents itself in the two stages having thelarge or small in
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Keywords: ., bookcentury1900, bookdecade1900, bookidforaminifera, bookyear1902
