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CONTENTS. 
Systematic descriptions of the Cyclostomata 
I. Division Inovicellata 
(а) Typical Cyclostomata 
Family Diastoporidae Gregory, 1899 
Forma Stomatopora Bronn, 1825 
Proboscina Audouin, 1826 
Berenicea Lamouroux, 1821 
Diastopora Lamouroux, 1821 
Spiropora Lamouroux, 1821 
(б) Trepostomatous like Cyclostomata 
Family Heteroporidae Pergens and Meunier, 1886 
Genus Ceriopora Goldfuss, 1827 
Reptomulticava D’Orbigny, 1852 
Defranciopora Hamm, 1881 
Heteropora Blainville, 1830 
Multicrescis D’Orbigny, 1852..' 
Fungella Hagenow, 1851 
Biflabellaria Pergens, 1894 
II. Division Ovicellata 
Subdivision Parallelata Waters 
Family Oncousoeciidae Canu, 1918 
Genus Oncousoecia Canu, 1918 
Peristomoecia, new genus 
Forma Filisparsa D’Orbigny, 1853 
Family Crisiidae Johnston, 1847 
Genus Crisia Lamouroux, 1816 
Crisidia Milne Edwards, 1838 
Family Plagioeciidae Canu, 1918 
Genus Plagioecia Canu, 1918 
Desmeplagioecia, new genus 
Family Macroeciidae Canu, 1918 
Genus Macroecia Canu, 1918 
Family Mecynoeciidae Canu, 1918 
Genus Mecynoecia Canu, 1918 
Forma Entalophora Lamouroux, 1821 
Genus Microecia Canu, 1918 
Exochoecia, new genus 
Family Diaperoeciidae Canu, 1918 
Genus Diaperoecia Canu, 1918 
Diplosolen Canu, 1918 
Lekythionia, new genus 
Crisulipora Robertson, 1910 
Desmediaperoecia, new genus 
Family Tubuliporidae Johnston, 1838 
Genus Tubulipora Lamarck, 1816 
Platonea,. new genus. 
Centronea, new genus 
Mesonea, new genus 
Erkosonea, new genus 
Pleuronea, new genus 
Tretonea, new genus 
Idmonea Lamouroux, 1821 
Idmidronea, new genus, 
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