BRYOZOA OF THE PHILIPPINE REGION 



141 



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); M 1 . 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 parvipunctata Maplestone, 1903. Zooecia with and without 

 ectocyst. There are two opesiules perforating the cryptocyst. T. Selenaria 

 jlagcllifera var. minor Maplestone, 1910. There are six marginal zooecia having 

 a peculiar inverted infundibular peristome. (R-T. After Maplestone.) 



