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 oi Platychelys Ohemdorferi, 

 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, charac- 

 terized by the peculiar structure of their marginal plates, persisted 

 from the Jurassic to the Tertiary period. Prof. EUtimeyer showed 

 (1868) the close analogies existing between the living Chelydra 

 serpentina and Platychelys Oherndorferi, and also such fossil forms 

 as C. Murchisoni, H. von Meyer, from (Eningen, 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 pre- 

 sents a continuous series of osteological transformations, the origin 

 of which has been traced by Professor Riitimeyer in young indi- 

 viduals of Chelydra and Platychelys, [Count M.] 



The Brtozoa 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 Bryo- 

 zoa 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 indi- 

 viduals than in species. The author recognizes only four species, 

 namely : — Tuhulipora conferta, Lepralia verruculosa, sp. n., Hemi- 

 eschara variabilis, and Diastopora corrugata. The last two species 

 present much diversity of form, which has misled Eichwald, who, 

 in his * Lethsea Rossica,* describes Hemieschara variabilis under the 

 names of Cellepora syrinx, G. tinealis, Vincularia teres, and V. tris- 

 tonia; and Diastopora corrtigata as Pustulopora primiyenia, fruticosa, 

 and mHa. [W. S. D.] 



