This monograph presents detailed descriptions of cyclostome bryozoans, including new species and terminology that help identify their tiny, box-like chambers. It covers the shapes of zooecia, the patterns of openings and closures, and how colonies grow and regenerate. Rich figure panels accompany the text to support recognition of features such as aperture forms, peristomial thickening, and the different forms of heterozooecia and kenozooecia. The work situates these forms in chalk and Senonian deposits, highlighting regional variation and the arrangement of zooecia within colonies.

Precise descriptions of zooecia shapes, apertures, and closure plates.
How regeneration occurs in old and new parts of the colony.
Different forms of heterozooecia and their relationships to zooecia and kenozooecia.
Annotated plates and figures that illustrate the species and their structural features.

Ideal for readers seeking a detailed reference on fossil bryozoans, their anatomy, and their preservation in chalk-age deposits.

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