The foraminifera: an introduction to the study of the protozoa . inarily thickened shell-wall, the rows of chamberlets occupying a proportion-ately small space. Genus Lacazina, Schlumbeegee. Test ovoid or subspherical ; the chambersarranged in an elongated coil, as in Alveolina, buthaving apertural communication alternately atopposite ends. The chambers are subdivided intochamberlets. Cretaceous and Tertiary. Example.—L. WicJniiairiii, Schlumberger, Bull. 104 THE FOEAMINIFERA EXPLANATION OF PLATE 4. A. Cornusjnra involvens, Keuss. x 30. B. h. Penero^jlis arietinus, Batsch sp.: h, oral aspect.
The foraminifera: an introduction to the study of the protozoa . inarily thickened shell-wall, the rows of chamberlets occupying a proportion-ately small space. Genus Lacazina, Schlumbeegee. Test ovoid or subspherical ; the chambersarranged in an elongated coil, as in Alveolina, buthaving apertural communication alternately atopposite ends. The chambers are subdivided intochamberlets. Cretaceous and Tertiary. Example.—L. WicJniiairiii, Schlumberger, Bull. 104 THE FOEAMINIFERA EXPLANATION OF PLATE 4. A. Cornusjnra involvens, Keuss. x 30. B. h. Penero^jlis arietinus, Batsch sp.: h, oral aspect. x 20. C. Peneroplis planatus, F. and ]M. sp. x 20. D. Peneroplis {Moiialysidium) Sollasi, Chapman. x 50. E. p. Orbici(linaadunca,F. and M. sp.: e, half-section of a fragmentof test showing chamberlets. E x 13, e x 32. F,/. Orhitolites complanata. Lam. (yonng specimens): /, transverseand vertical sections (after Carpenter). F x 30,/x 36. G,.9. Alveolina Boscii, Defr. sp.: g, transverse section (after Brady).xl5. H, Keramosplicera Murrayi, Brady, x 7. PLATE Family II. (concludecl). THE FAMILY MILIOLID^E ]07 Soc. Cxeol. France, ser. 3, vol. xxii. 1894, p. 296, and text figure 1. The test in this species resembles AlveoliuaHplurrica^ but with the internal arrangement ofchambers peculiar to Lacazina. The chamberletsare small, with much secondary shell growth, as inFlosculiua. Surface of the test pitted. Tertiary,New Guinea. Sub-famil// 6. Test spherical, chambers in concentric layers. Genus KeramosjjlicEra, Beady. Test spherical, composed of a multitude of moreor less irregularly shaped chamberlets arranged inconcentric layers. This form appears to be iso-morphous with the hyaline Gijpsina cjlohiilus. Example.—K. Murrayi, Brady, Ann. and Hist. ser. 5, vol. x. 1882, p. 242, pi. xiii. In transverse section the test appears somewdiatlike that of Orhitolites in its arrangement of thechamberlets, but it is more irregular, and the pore
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