. Bulletin of the British Museum (Natural History). 68 PITT AND TAYLOR (1976) for some of the cerioporine genera. Unfortunately many of these type species were founded by d'Orbigny (1851- 54), who used large syntypic suites of specimens from more than one locality when describing his new species. Not only is it usually difficult or impossible to match any one syntype to d'Orbigny's stylized published figures, but each syntypic suite may comprise more than one species. A full revision of the d'Orbigny Collection (housed in the MNHN, Paris) is of paramount importance to the future prog
. Bulletin of the British Museum (Natural History). 68 PITT AND TAYLOR (1976) for some of the cerioporine genera. Unfortunately many of these type species were founded by d'Orbigny (1851- 54), who used large syntypic suites of specimens from more than one locality when describing his new species. Not only is it usually difficult or impossible to match any one syntype to d'Orbigny's stylized published figures, but each syntypic suite may comprise more than one species. A full revision of the d'Orbigny Collection (housed in the MNHN, Paris) is of paramount importance to the future progress of systematic studies of Cretaceous cyclostomes. The generic ranges quoted below arc highly tentative but are believed to represent an improvement in precision and accuracy on previously published data (Bassler 1953). Abbreviations of measured morphological characters are shown in Fig. 2 and its caption. Additional abbreviations used in the text but not shown on this figure are: BW, branch width; KAM, kenozooecial apertural measurement; LOPM, longitudinal ooeciopore measurement; LOSM, longitudinal ooeciostome measurement; TOPM, transverse ooeciopore measurement; TOSM, transverse ooeciostome Fig. 2 Measured morphological characters in cyclostome bryozoans from the Faringdon Sponge Gravel. Abbreviations: FWL, frontal wall length (of autozooecia); FWW, frontal wall width; GDL, gynozooecium dilated length; GTL, gynozooecium total length; GW, gynozooecium width; LAM, longitudinal apertural measurement (of autozooecia); LPM, longitudinal peristome measurement; TAM, transverse apertural measurement; TPM, transverse peristome measurement. It should be noted that measurements of zooecial and zoarial dimensions have generally been made from a limited number of specimens and may not encompass the entire range of values present in the species. Pseudopore densities have been calculated by placing a square of known area over SEM prints at a standard magnification of x 320,
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