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.]
