mm. Approximate median length of skull 136 Width of skull across base of horns 150 Estimated width across tips of horns 186 Width of horn at base 31 Estimated length of horn from base 80 Width of skull across orbits 97 Diameter of orbit 21 Diameter of large tooth alveolus 7 Diameter of small tooth alveolus 2 Pictou Coal, near Pictou, Nova Scotia, Canada, collected by Dr. J. William Dawson, 1850, and presented by him to the Geological Society of London. =Baphetes minor Dawson.= Dawson, Canadian Nat. and Jour. Sci., n. s., 1870, V, pp. 98, 99. Type: Specimen in the Peter Redpath Museum, McGill University. Horizon and locality: Coal formation of Nova Scotia. The species was based on a lower jaw of an amphibian, of which a cast had occurred in the coarse sandstone of the coal formation between Ragged Reef and the Joggins Coal Mine. It measured 6 inches in length; its surface was marked on the lower and posterior part with a network of ridges inclosing rounded depressions. The anterior part of the jaw contained about 16 teeth, some of which remained in the matrix. These were stout, conical and blunt, with large pulp cavities, and about 32 longitudinal striæ, corresponding to the folds of the dentine. Dawson states that this jaw resembles most closely those of _Baphetes_ and _Dendrerpeton_, but more especially the former. He regarded it as distinct from _Baphetes planiceps_, and proposed for it the name _Baphetes minor_. =Eosaurus acadianus Marsh.= Marsh, Am. Jour. Sci. (2), XXXIV, pp. 1-16, pls. i, ii, 1862. Agassiz, Am. Jour. Sci., XXXIII, p. 138, 1862. Marsh, Quart. Jour. Geol. Soc., XIX, pp. 52-56. Hay, Cat. Fossil Vertebrates (Bull. U. S. Geol. Surv. No. 179, p. 421, 1902). Type: Specimen No. 1648, Yale University Museum. Horizon and locality: South Joggins, Nova Scotia (Coal Measures). The genus and species are founded on two vertebral bodies of the stereospondylous type from the Coal Measures of the South Joggins, Nova Scotia. Marsh's description (404) is as follows: