CONTENTS. XI 



Systematic descriptions Continued. 



Order Cheilostornata Busk- Continued. 



Suborder Ascophora Levinsen, 1!!09 Continued. 



Family Phylactellidae Canu and Bassler, 1917 Continued. Page. 



Genus Lagenipora Hincks, 1877 591 



Ascosia Jullien, 1882 592 



Temachia Jullien, 1882 592 



Family Cellep>oridae Busk, 1852 592 



Genus Schismopora MacGillivray, 1888 598 



Osthimosia Jullien, 1888 601 



Costazzia Neviani, 1895 603 



Holoporella Waters, 1909 604 



Acanthionella Canu and Bassler, 1917 614 



Kleidionella Canu and Bassler, 1917 617 



Family Conescharellinidae Levinsen, 1909 622 



Genua Fedora Jullien, 1882 623 



Stichoporina Stoliczka, 1861 624 



Schizorthosescos Canu and Bassler, 1917 626 



Orbitulipora Stoliczka, 1861 628 



Batopora Reuss, 1867 629 



Diplotaxis Reuss, 1867 629 



Oonescharellina D'Orbigny, 1851 630 



Bipora Whitelegge, 1887 631 



Flabellipora D'Orbigny, 1852 631 



Mamillopora Smitt, 1872 632 



Order Cyclostomata 633 



General consideration of the Cyclostomata 634 



The tubes 634 



Calcification 634 



Cylindrical tubes or trepostomatous like Cyclostomata 636 



( 'lubshaped tubes or typical Cyclostomata 637 



Tubes with facets 637 



Tubes with rhomboidal orifice 637 



The orifice or apertura 640 



Diaphragms 640 



Accessory tubes 641 



Tergopores 641 



Firmatopores 643 



Nematopores , 643 



Dactylethrae 644 



Cancelli 644 



Adventitious tubes 645 



Vacuoles 645 



Mesopores 645 



Gemmation 647 



Zoarium 648 



Form 648 



Basal system of fixation 648 



Growth 648 



Branching 649 



Origin of the zoarium 650 



Ovicells . . 651 



