Page:The Habitat of the Eurypterida.djvu/155

Rh alone are present besides the rare Pterygotus" (245, 9). (See sketch map, fig. 14.)

While Alth's paper is undoubtedly excellent for the general stratigraphy and palaeontology of Galicia and Podolia, involving as it does not only the results of his own studies but also those of the earlier investigators, it yet fails to give just the details which are essential for the problem in hand. It helps us very little to know that the eurypterids and a large number of the fossils are found in beds some

25–30 feet thick; the important fact is whether or not they occur in thin bands, isolated from the remaining fossils as is the usual way. It must in fairness be stated that Alth's section on the Upper Siluric beds, or as he called them, the "compact and bituminous limestones," does not pretend to be more than a resume of the important but little known works by Barbôt, de Marny and Malewski, written in Russian, but now made available through this careful German summary. Schmidt's statement has shown that the mode of occurrence above