Page:Quarterly Journal of the Geological Society of London, vol. 25.djvu/638

14 GEOLOGICAL MEMOIRS. wald, with the Jurassic Chelonians from Soleure ("Etage Strombien"), Kehlheim (Solenhofen), and Hanover (Kimmeridge). Those from Kehlheim were described, under the name of Platychelys Oberndorferi, in 1853, by Prof. A. Wagner, and by H. von Meyer in 1860. Other similar forms from the Swiss Jurassic deposits, and from the English Wealden and Purbeck strata, described by M. Pictet and by Prof. Owen, prove that the series of Chelydroid Chelonians, characterized by the peculiar structure of their marginal plates, persisted from the Jurassic to the Tertiary period. Prof. Rutimeyer showed (1868) the close analogies existing between the living Chelydra serpentina and Platychelys Oberndorferi, and also such fossil forms as C. Murchisoni, H. von Meyer, from OEningen, C. Decheni, H. von Meyer, from the Rhenish laminated coal, and the incomplete remains from Eibiswald described by Prof. Peters (1850) as "Chelydra, sp." These analogies are especially evident in the dorsal carapace, which has served for the establishment of the genus Chelydropsis. Its double row of marginal plates, such as at present occurs only in the American Chelonura Temmincki, Holbr., exactly reproduces the type of the above-mentioned Jurassic forms, and would probably be still more conspicuous in young individuals. The Hanoverian fossil forms lately described by Dr. Maak in his great work on the systematic arrangement of the Chelonia, exhibit the same type, although less distinctly, and also present remarkable instances of the combination of osteological types which have been completed and differentiated in subsequent periods. The family of the Chelydrians thus presents a continuous series of osteological transformations, the origin of which has been traced by Professor Rutimeyer in young individuals of Chelydra and Platychelys, [Count M.]

The Bryozoa of the Tertiary Deposits of Kischenew, in Bessarabia. By Prof. Reuss.

[Proc. Imp. Acad. Vienna, June 17, 1869.]

These deposits belong to the Sarmatian stage, the remains of Bryozoa from which have been but little studied. In the Vienna basin they are rare and indistinct, but several species have been obtained from Hungary and Transsylvania. The rock at Kischenew, a lime-stone consisting chiefly of shells cemented together, contains many specimens of Bryozoa, which, however, are more abundant in individuals than in species. The author recognizes only four species, namely:— Tubulipora conferta, Lepralia verruculosa, sp. n., Hemieschara variabilis, and Diastopora corrugata. The last two species present much diversity of form, which has misled Eichwald, who, in his 'Lethaea Rossica,' describes Hemieschara variabilis under the names of Cellepora syrinx, G. tinealis, Vincularia teres, and V. tristonia; and Diastopora corrugata as Pustulopora primigenia, fruticosa, and curta. [W. S. D.]