418 Reviews — Gaudry's Animal World. 



paper seems quite sufficient to settle the question. The fossils are 

 referred to the genera Ethmosphcera, Heliosphara, Caryosphara, 

 Lithopera, Spirocampe, Dictyomitra, Euchitonia, Stichocampsa, and 

 Polystichia : Microlecitos is a new genus. Moreover, there seems 

 to be no doubt that the albite has been formed in situ around the 

 Eadiolaria, the material in the chambers of which is often different from 

 that of the albite around it; a halo of less transparent matter also 

 often surrounds the test of the fossil. The limestone shows signs 

 of erosion by acidulated water, and Issel attributes the formation of 

 the calciphyre to hydrothermal agencies acting upon a calcareous 

 marl at or subsequent to the emission of the overlying "anfimor- 

 phic" rocks. Hence he concludes "that from this we see that the 

 formation of large crystals of felspar in the heart of a sedimentary 

 rock may be a local phenomenon produced independent of the cause 

 to which metamorphism is by many attributed." J. W. G. 



III. — "Ichthyosaurus campylodon e Tronchi di Cicadee nelle 

 Argille scagliose dell' Emilia." By Prof. G. Capellini. 

 [Mem. E. Accad. Sci. Istit. Bologna, ser. 4, vol. x. (1890), 

 pp. 1-24, pis. i. ii.] 



IN the Bulletin of the Italian Geological Society last year (vol. viii. 

 pp. 43-45), Prof. D. Pantanelli announced the discovery of 

 Saurian jaws in the supposed Eocene beds of Emilia, determining 

 them to be Crocodilian, and applying to them the name of Gavialis 

 mutinensis. Prof. Capellini now gives good figures and a detailed 

 description of the fossil in question, proving that it is a fragment of 

 the snout of Ichthyosaurus campylodon, and must have been derived 

 from the Cretaceous formation. The Professor is also engaged at 

 present, in collaboration with Prof. Solms Laubach, upon a mono- 

 graph of the fossil Cycads of Emilia : he thus adds a description and 

 figure of a Cycadean stem from the same horizon as the Ichthyo- 

 saurus snout, proposing for it the name of Baumeria masseiana. 



EEYIEWS. 



I. — The Connexions of the Animal World in Geological Times. 



Les Enchainements du Monde Animal dans les Temps 

 Geologiques — Fossiles Secondaires. By Albert Gaudry. 

 pp. 523, and 403 Woodcuts. (Paris, 1890.) 



WITH this volume we have the third, and we presume the final, 

 part of Prof. Gaudry's 'Enchainements '; and its appearance 

 would seem to indicate that the work as a whole has been a financial 

 success. If such a work were published in this country, we confess 

 we should be rather at a loss to indicate the class of readers to whom 

 it would be acceptable, since it makes no pretence to be a scientific 

 and detailed palasontological manual, and yet appears to be too 



