1. Dentalium ingens, de Koninck, and D. ornatum, de Kon. (Descrip. Animaux Foss., pp. 317 and 318, t. 22, f. 2 and 3).— The first of these species has been often recorded from Scotch Carboniferous rocks, but, so far as I am aware, the second is new not only to Scotland, but in British Carboniferous rocks generally. Specimens were forwarded to Prof. L. G. de Koninck, M.D., who was kind enough to confirm my determination. Our specimens of both the above species show the growth striæ of the shell to have been waved, like the septa of some Orthoceratites, consequently I presume the anterior apertures would be similar. In Prof. de Koninck's figures the striæ are oblique, and the anterior aperture is described as oblique. D. ingens is from the shale above the Skateraw Limestone (L. Carb. Limestone Group) at East Barns, near Dunbar, and D. ornatum from shale above the Roscobie Limestone at Roscobie.