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TABLE OF CONTENTS. 
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• Page. 
Introduction. 1 
Catalogue of papers of American Later Tertiary and Quaternary Bryozoa. 2 
Lists of North American Later Tertiary and Quaternary Bryozoan faunas. 4 
Systematic descriptions...'.... 15 
Order Ctenostomata Busk..._. 15 
Family Terebriporidae Busk, 1839. 15 
Genus Terebripora D’Orbigny, 1839. 15 
Genus Spathipora Fischer, 18Q6.•_. 16 
Order Cheilostomata Busk. 17 
Suborder Anasca Levinsen. 17 
Division I. Malacostega Levinsen. 17 
Family Electrinidae D’Orbigny, 1851. 17 
Genus Electra I.amouroux, 1816. 17 
Genus Pyripora D’Orbigny, 1852. 19 
Genus Mystriopora Lang, 1915. 19 
Genus Membranipora Blainville, 1834. 20 
Group Membraniporae Canu and Bassler, 1917. 24 
Section I. No ovicell. 24 
Genus Membraniporina Levinsen, 1909. 24 
Genus Conopeum Norman, 1903. 26 
Genus Cupuladria Canu and Bassler, 1919. 28 
Genus Acanthodesia Canu and Bassler, 1919. 30 
Section II. Membraniporae with endozooecial ovicell. 35 
Genus Vibracellina Canu and Bassler, 1917. 35 
Genus Membrendoecium Canu and Bassler, 1917. 36 
Genus Ogivalina Canu and Bassler, 1917. 37 
Genus Hincksina Norman, 1903. 38 
Section III. Ovicell hyperstomial, always closed by the operculum. 39 
Genus Membraniporidra Canu and Bassler, 1917. 39 
Section IV. Ovicell never closed by the operculum. 39 
Genus Alderina Norman, 1903..•. 39 
Genus Callopora, Gray, 1848... 40 
Genus Amphiblestrum Gray, 1848. 44 
Genus Ramphonotus Norman, 1894,. 46 
Genus Cauloramphus Norman, 1903... 48 
Family Aeteidae Smitt, 1867. 49 
Genus Aetea Lamouroux, 1812.. 49 
Family Chaperiidae Jullien, 1888. 49 
Genus Chaperia Jullien, 1881... 49 
Family Farciminariidae Busk, 1852..... 55 
Genus Nellia Busk, 1852... 55 
Family Opesiulidae Jullien, 1888. 56 
Genus Floridina Jullien, 1881. 56 
Genus Velumella Canu and Bassler, 1917. 58 
Genus Micropora Gray, 1848. 58 
Genus Selenaria Busk, 1854. 59 
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