species is of interest because it represents an additional discovery of the scaled Amphibia in North America. The species previously known from the Linton, Ohio, deposits is _Cercariomorphus parvisquamis_ Cope. Dermal scales have also been observed in specimens of _Amphibamus grandiceps_ Cope and _Micrerpeton caudatum_ Moodie (462, 478) from the Mazon Creek, Illinois, beds, and Sir William Dawson (208) described scales accompanying several forms from the Joggins deposits of western Nova Scotia. [Illustration: MOODIE PLATE 21 1. Mandible of _Micrerpeton deani_ Moodie, from the Linton. Ohio, Coal Measures. Original in American Museum of Natural History, No. 2934. × 0.6. 2. Portion of the skull of _Micrerpeton deani_ Moodie, possibly of the same individual as the mandible. From the Linton, Ohio, Coal Measures. Original in American Museum of Natural History, No. 3535 G. × 0.4. 3. Type of _Cercariomorphus parvisquamis_ Cope, from the Linton, Ohio, Coal Measures. Original in American Museum of Natural History. × 1. 4. An additional specimen of _Cercariomorphus parvisquamis_ Cope, from the Linton, Ohio, Coal Measures. Original in American Museum of Natural History. × 1. 5. Skull of _Sauropleura scutellata_ Newberry. From the Coal Measures of Ohio. × 1. 6. Tooth of _Mastodonsaurus_ sp. indet. of the Carboniferous of Kansas. Original in University of Kansas Museum. × 1. 7. Tooth of _Mastodonsaurus giganteus_ Jaeger, from the Triassic of Germany. Introduced for comparison with the tooth from the Kansas Carboniferous. × 1. ] Measurements of the Types of Ichthyerpeton squamosum Moodie. Length of animal as estimated from two impressions 3 ft. Length of longest impression 21 in. Length of specimen containing tail impression 9 in. Width of tail impression: Maximum 50 mm. Minimum 6 mm. Width of a single scale 1 mm. Distance from base of tail to tip 125 mm. Length of specimen as preserved 225 mm. Width of chevron rod space 30 mm. Length of rib 25 mm. 8 chevrons in a distance of 3 mm. =Genus CERCARIOMORPHUS Cope.= Cope, Proc. Amer. Phil. Soc., 1885, p. 405. Type: _Cercariomorphus parvisquamis_ Cope. The type specimen of this genus is supplemented by a portion of the body of another specimen which adds a little to our knowledge of the animal's form, but nothing as to structure. Cope's original description is as follows: