. Bulletin - United States National Museum. Science. Fig. 34.—Genus Monsella Canu, 1900 A-D. Monsella (Planicellaria) eocena Pergens, 1886. A. Front view, X25. B. Side view, X25. C. Poorly preserved fragment, X25, showing zooecia in which the anterior calcareous lamella is partly or totally destroyed. D. Trans- verse section, X25. (A-D. After Pergens, 1886.) Eocene (Montian), of Belgium. (Explanation of fig. 33) A. Selenaria flagellifera Maplestone, 1910. Colony with its vibracula in movement, X6. (After Maplestone, 1910.) B-N. Selenaria maculata Busk, 1854. B. Colony, natural size. C. The zoo
. Bulletin - United States National Museum. Science. Fig. 34.—Genus Monsella Canu, 1900 A-D. Monsella (Planicellaria) eocena Pergens, 1886. A. Front view, X25. B. Side view, X25. C. Poorly preserved fragment, X25, showing zooecia in which the anterior calcareous lamella is partly or totally destroyed. D. Trans- verse section, X25. (A-D. After Pergens, 1886.) Eocene (Montian), of Belgium. (Explanation of fig. 33) A. Selenaria flagellifera Maplestone, 1910. Colony with its vibracula in movement, X6. (After Maplestone, 1910.) B-N. Selenaria maculata Busk, 1854. B. Colony, natural size. C. The zooecia and vibracula are covered by the ectocyst. (B, C. After Busk, 1854.) D. The membrane covering the front of the zooecium has trabeculae surrounding the operculum, X 85. (After Waters, 1889.) E, F, G. Zooecia without ectocyst showing the opesiular indentations. E. A recent specimen. (After Busk, 1874.) F, G. Fossil and recent specimens. (After Waters, 1887.) H. Operculum from inside, showing trabeculae, and below the operculum two muscles attached to the frontal membrane, X150. I. Operculum, X85. Size for comparison with Figure H. J. Portion of vibracular seta showing spinous fringe on one side, X325. (H-J. After Waters, 1921.) K, L. Inner face of zoarium of fossil specimens. (K, L, M. After MacGillivray, 1895.) M. Inner face of a recent zoarium (after Busk, 1854); M1. zooecia enlarged. N. Sagittal section showing a piece of shell on which the colony has commenced to grow. It will be noticed that the early central zooecia are very small, X 12. O. Selenaria 'punctata T. Woods, 1880. Section showing a piece from which the central supporting flake has disappeared, X12. P, Q. Selenaria concinna T. Woods, 1880. P. Vibraculum, X50. At the distal end of the vibraculum there is an incomplete ring attached by a kind of stalk at one side of the vibraculum. Q. Section showing double expansion of a pore tube under the supporting flake, X25. (N-Q. After Waters, 1921.) R, S. Selenaria p
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