ABT. 22. CYCIiOSTOMATOUS BRYOZOA — CANU AND BASSLER. 145 



17. End of a branch, enlarged (after D'Orbigny, 1853). 



18. Transverse thin section across branch, X 10 (after Gregory, 1896). 



19. Photograph of surface, X 12, showing ovicells ; branch inverted to illus- 



trate form of ovicell. 

 Jurassic, of France and England. 



Plate 11, 



Figs. 1-5, Platonca scalaria, new species page 40. 



1. Fragments of the branching zoarium, natural size. 



2. An ovicelled branch, X 12, with the fascicles alternately arranged and 



showing the oeciostome adjacent to a tube. 



3. A branch, X 12, with the ovicell at the bifurcation. 



4. An ovicelled example, X 12, with the fascicles opposite each other; 



the ovicell lacks the oeciostome, 



5. A small, basal, ovicelled branch, X 12; the oeciostome is isolated. 

 Recent: Philippine Islands, Sirun, Tawi Tawi group. 



Figs. 6, 7. Platonea hirsiita, new species page 49. 



The type specimen natural size and X 12. 



Recent : Philippine Islands, Sirun, Tawi Tawi group. 



Figs. 8-10. Tennysonia stelkita Busk, 1867 page 51. 



8, 9. Portions of two zoaria, natural size. 



10. Enlargement of a frond showing the zooecia separated by numerous 



mesopores. 

 Recent : Cape of Good Hope. 

 Figs. 11-14. Lobosoeda semiclansa Michelin, 1846 page 52. 



11. Fragment, natural size. 



12. Portion of an ovicelled zoarium, X 12. 



13. Posterior (inferior) side of the same specimen, X 12. 



14. Transverse section, X 12. 



Recent: Port Elizabeth, South Africa. 



Plate 12. 



Figs. 1-3. Lichenopora hurdigalcnsis Duvergler, 1921 page 80. 



1. Inferior side of type specimen, X 12. 



2. Superior side of the same specimen, X 12, showing the digitate ovicell. 



3. A portion, X 25, illustrating the tubes and cancelli. 



Miocene (Upper Burdigalian) : Saucats (Gironde), France. 

 Figs. 4-11. Lohosoccia semicUntsa Michelin, 1846 page 81. 



4. Fragments, natural size. 



5. Ovicelled fragment, X 12, exhibiting the oeciostome turned toward the 



base. 



6. Portion of the same, X 25. 



7. Another ovicelled fragment, X 12, in which the ovicell is composed of 



lobes and covers all the subjacent tubes. The oeciostome is turned 

 toward the top. 



8. 9. An ovicelled branch, X 12 and X 25, in which all the subjacent tubes 



are not closed. 



10. Unovicelled portion of branch, X 25, showing the structure of the zooecial 



areas (facettes). 



11. Diagrammatic view of the facettes, enlarged (after Gregory, 1899). 



Cretaceous (Cenomanian) : LeMans (Sarthe), France. 



