TABLE OF CONTENTS. 



Page. 



Preface 5 



Principles of classification 7 



Systematic diagnoses 9 



Suborder Anasca, division Malacostega 9 



Family Electrinidae D 'Orbigny 9 



Membraniporae, new group 9 



Family Aeteidae Smitt 22 



Scrupocellariidae Levinsen 23 



Farciminariidae Busk 23 



Eucratiidae Hincks 24 



Suborder Anasca, division Coilostega 25 



Family Opesiulidae Jullien 25 



Subfamily Onychocellidae Jullien 25 



Microporidao Hincks 27 



Lunulariidae Levinsen 30 



Family Aspidostomidae Canu 30 



Steganoporellidae Levinsen 31 



Thalamoporellidae Levinsen 32 



Suborder Anasca, division Pseudostega 32 



Family Cellariidae Hincks 32 



Coscinopleuridae Canu 33 



Suborder Ascophora 34 



TheCostulae 34 



Family Acroporidae Canu 37 



Hippothoidae Levinsen 38 



Escharellidae Levinsen 38 



Group Schizoporellae 39 



Hippoporinae 41 



Peristomellae 43 



Microporellae and divers genera 44 



Family Stomachetosellidae, new 44 



Smittinidae Levinsen 50 



Reteporidae Smitt 55 



Galeopsidae Jullien 56 



Hippopodinidae Levinsen 60 



Tubucellariidae Busk 62 



Catenicellidae Busk 63 



Adeonidae Jullien 64 



Phylactellidae, new 66 



Celleporidae Busk 71 



Conescharellinidae Levinsen 73 



Explanation of plates 77 



Index 83 



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