Vertebræ short and stout, and apparently well ossified. Ribs long, with double head and much curved. Humerus longer than femur, which is short and stout, if the bone taken for it is rightly determined. Abdominal scales narrow, oat-shaped; thoracic plate large, broadly oval. Measurements of Hylerpeton longidentatum Dawson. Length of mandible 4 cm. Length of vertebra 5 mm. Length of rib 3 cm. Length of humerus 1.5 cm. Length of femur (?) 1.2 cm. Length of tibia 8 mm. Length of mandibular teeth 3 mm. 6 to 7 teeth in 1 cm. =Hylerpeton intermedium Dawson.= Dawson, Proc. and Trans. Roy. Soc. Canada, XII, p. 75, 1895. Type: Specimen No. 3061-5, Peter Redpath Museum, McGill University. Horizon and locality: Coal formation at the South Joggins, Nova Scotia. This species is known only by the mandibles and portions of the skull, which are rather shorter than those of adult individuals of the last species. The extremity of the mandible and the cranial bones have the same slightly waved surface as in the other species. Mandibles 3 cm. long and the teeth, which are about 15 in each ramus of the lower jaw, are simple, with large pulp cavities, those of the maxillary bone slightly enlarging upwards, and intermediate in form between the long, slender teeth of _H. longidentatum_ and the thick, obtuse teeth of _H. dawsoni_. Coal formations, South Joggins, Nova Scotia, in erect tree, discovered by P. W. McNaughton, 1893. =Genus FRITSCHIA Dawson, 1882.= Dawson, Phil. Trans. Roy. Soc. London, 1882, pt. II, p. 634. Lydekker, Cat. Fossil Reptilia and Amphibia, pt. IV, p. 225, 1889. Type: _Fritschia curtidentata_ Dawson. Body lizard-like; limbs large and well-ossified, mandibular and maxillary teeth conical, grooved at the apex. Abdominal scales slender and rod-like. =Fritschia curtidentata Dawson.= Dawson, Phil. Trans. Roy. Soc. London, 1882, pt. II, p. 641, pl. 43, figs. 110-128. Dawson, Am. Jour. Sci. (3), XII, p. 444, 1876. Type: Specimen No. 3061-7, Peter Redpath Museum, McGill University. There is also specimen No. R 449, in the British Museum (393, pt. IV, p. 225). Horizon and locality: Coal formation at the South Joggins, Nova Scotia. Represented by 2 specimens (plate 8). Bones of the head very smooth, only a few microscopic punctures. Teeth conical, somewhat obtuse, striated at the inner side of the apices; there are about 30 in each ramus of the mandible, and about 27 in the maxillary bone. Teeth implanted in a furrow. Vertebræ short and well ossified, 3 in 1 cm. Ribs strong, curved, about 1 cm. in length. Limbs robust, the bones better ossified than in any other known species from Nova Scotia. Toes of foot probably 5, central ones long and slender. Interclavicle of moderate size and somewhat rounded. Ventral scutellæ needle-like.