The Genus Tremogasterina Canu (Bryozoa, Cheilostomata) Patricia L. Cook Department of Zoology, British Museum (Natural History), Cromwell Road, London SW7 5J^ a->/ ?\ %y^ '%/'■>> Contents Synopsis Introduction . Abbreviations and terminology Astogeny Ontogeny of zooid walls The frontal calcified shield and hydrostatic apparatus Zooidal communications .... Oral spines and oral condyles Ontogeny and astogeny of the avicularia . Ontogeny and astogeny of brood chambers (ovicells) . Coding of characters and results of polythetic clustering Evolutionary trends and distribution in time and space Relationships among umbonuloid cheilostomes Problems arising and further fields of work Systematic section The genera Poricella and Tremogasterina Tremogasterina Canu T. problematica Canu T. mafonnica (Canu) T. areolata (Reuss) T. pouyetae sp. nov. The Tremogasterina mucronata-complex a. T. mucronata (Smitt) b. T. miocenica" populations c. T. subspatulata Osburn . T. lanceolata Canu & Bassler T. robusta (Hincks) .... The Tremogasterina oranensis-brancoensis-compl a. T. oranensis (Waters) b. T. brancoensis (Calvet) . T. celleporoides (Busk) . T. spathulata (Canu & Bassler) T. perplexa Cook . T. musaica sp. nov. Acknowledgements . Summaries in French and German Appendix and Maps References 103 104 105 106 107 107 109 111 111 114 116 120 122 123 124 124 126 127 127 128 129 130 130 131 131 132 133 134 135 135 136 136 138 138 139 139 140 164 Synopsis The development of the general concept of the characters of the genus Tremogasterina is discussed, and a summary of the character correlations now considered to be typical of the genus is given. The astogeny oi tne colony, and the ontogeny of the umbonuloid frontal shield and secondary Calcified orifice is aescribed, together with observations of the ontogeny and astogeny of the avicularia and brood chambers lovicells). Analy sis of populations indicates that two divergent trends in zooid and colony structure may Issued 27 October 1977 103 Bull. Br. Mus. nal. Hist. (Zool.) 32 (5): 103-165
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