Abstract
SUMMARY The order Microsauria was established by Dawson on the basis of specimens from the Joggins formation of Joggins, Nova Scotia. Restudy of material from this locality has revealed that the originally named species, Hylonomus lyelli, is actually a reptile. Numerous other specimens in this fauna are, in contrast, microsaurs as the term is currently used, i.e. lepospondyl amphibians. These forms show no significant similarities with early reptiles. Three genera are related to the Permian gymnarthrids and two to the genus Tuditanus from Linton, Ohio. Other material cannot be placed in any previously described group. Comparison is made with three related genera from the Czechoslovakian gas-coal, described earlier by Fritsch. All of these genera were apparently terrestrial, with well-developed limbs.
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