. Bulletin of the Natural Histort Museum. Geology series. 122 C. BUTTLER. Fig. 8 Leioclema sp. A. NHM PD 8307; longitudinal section, x22. Figs 9-10 Leioclema sp. A. 9, NHM PD 8308: transverse section, x22. 10, NHM PD 8307; tangential section, showing petaloid autozooecia, xlOl. Fig. 11 Leioclema sp. B., NHM PD 8306; 11a, longitudinal section, x86; lib, transverse section, x55; lie, tangential section, x86. Figs 12, 13 Leioclema! sp. 12, NHM PD 8138; longitudinal section, x22. 13, NHM PD 8137; 13a, tangential section, x30; 13b, tangential section, showing large acanthostyles indenting autozooec
. Bulletin of the Natural Histort Museum. Geology series. 122 C. BUTTLER. Fig. 8 Leioclema sp. A. NHM PD 8307; longitudinal section, x22. Figs 9-10 Leioclema sp. A. 9, NHM PD 8308: transverse section, x22. 10, NHM PD 8307; tangential section, showing petaloid autozooecia, xlOl. Fig. 11 Leioclema sp. B., NHM PD 8306; 11a, longitudinal section, x86; lib, transverse section, x55; lie, tangential section, x86. Figs 12, 13 Leioclema! sp. 12, NHM PD 8138; longitudinal section, x22. 13, NHM PD 8137; 13a, tangential section, x30; 13b, tangential section, showing large acanthostyles indenting autozooecial walls, xl 12. Fig. 14 Hallopora peculiaris Pushkin (in Ropot & Pushkin, 1987). NHM PD 8396; longitudinal section, x22. Fig. 15 Hallopora aff. wesenberginia (Dybowski, 1877), NHM PD 8312; 15a, longitudinal section, x22; 15b, tangential section, x37. Limestones (middle Ordovician) of Kentucky which are very similar to those from Minnesota and Iowa. Restudy is needed to assess the variability within the species, and it is possible that the Estonian and American forms are different species. Until further material can be examined, this one incomplete specimen is left in open nomenclature. Genus HETEROTRYPA Nicholson. 1879 Heterotrypa sp. Material. NHM PD 8314. Fig. 7 Description. Zoarium erect with thin cylindrical branches, on average 4 mm in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Natural History Museum (London). Andover : Intercept
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