272 Bibliographical Notices. 



tially dissolved ; in this case the dissolved portion is precipitated 

 in combination with iodine, if the acid be diluted with water, of 

 a splendid and intense blue colour, while the portion of the mem- 

 brane, the organic structure of which has not been destroyed, 

 although it has undergone a considerable breaking up, exhibits 

 the blue colour but weakly in proportion, and frequently appears 

 green on account of the preponderating intensity of the yellow 

 colour. Since in this manner a perfect destruction of the orga- 

 nization of the secondary incrusting layers renders it possible for 

 the reaction of cellulose toward iodine and sulphuric acid to ma- 

 nifest itself, it is certainly conceivable that in cases where the sul- 

 phuric acid is not in a condition to affect a membrane, cellulose 

 may be present in it, but be protected from the action of the acid 

 by the incrusting matter, and thus rendered imperceptible. 



BIBLIOGRAPHICAL NOTICES. 



Palceontographica : Beitriige zur Natiirgeschichte der Vorwelt. Heraus- 

 gegeben von Dr.W. Dunker und Herm. von Meyer. 1 Band, 

 1 Lieferung. — Palceontographica : Contributions to the Natural His- 

 tory of the Antediluvian JEra. Edited by Dr. William Dunker 

 and Hermann von Meyer. Vol. i. part 1. 4to. 44 pp. and six 

 plates. 



Under this title the editors intend giving full descriptions of re- 

 markable fossils hitherto unpublished, illustrated by accurate and 

 highly finished plates. The first part contains: 1. A description 

 of a new species of Pterodactylus, Pt. Gemmingii, by Hermann von 

 Meyer, followed by a synoptical table of all the sixteen species 

 hitherto known of that highly interesting genus of flying Saurians. 

 2. A description of Aspidura Ludenii, by Friedrich von Hagenow, — a 

 very curious species of QphiuridcE found in the " Muschelkalk " near 

 Jena. 3. A description of a superb palate of Myliobatis Testa, new 

 species, from Sicily ; of Tornatella abbreviata, new species from the 

 Gosau formation; and two teeth of Squalidce, found near Cassel. 

 4. A description of Omphalomela scabra, a fossil trunk of a plant found 

 in the limestone banks of the Keuper formation near Kolleda in Thu- 

 ringia, by Professor Germar. 5. Description of several new plants 

 from the copper- slate formation of Richelsdorf, by J. Althaus, with 

 a synopsis of all the plants hitherto met with in that formation. 

 6. Descriptions of several new species of shells, partly marine, partly 

 fluviatile, recently discovered near Halberstadt in a sandstone be- 

 longing to the lias formation, and highly remarkable from their per- 

 fect preservation, which allows in many cases of their colours being 

 recognised. 7. Enumeration of the fossil shells occurring in the ter- 

 tiary formation of Magdeburg, by Dr. Philippi. 



