Revieivs — The Falceontographical Society, 177 



In the Conclusion to his Silurian Monograph we find the following 

 passage, which is well wortliy to be recorded as evidencing the 

 spirit in which this work has been carried on : — 



"I should desire my readers," says Mr. Davidson, "to look upon this, 

 as well as upon the whole series of my Monographs, as a bold out- 

 line sketch, and not as a finished picture, and as still demanding 

 much labour and research, from many experienced hands, before it 

 can be regarded by the scientific public as in any way approaching 

 a complete work" (p. 345). 



We can only hope that other authors maybe able to write "Finis" 

 to their Monographs with as clear a conscience on the score of com- 

 pleteness as our friend Mr. Davidson ! 



It is pleasant to know that we are not to lose his company in the. 

 future volumes of this Society, for he promises us, if his health per- 

 mits, to add supplements to the Cretaceous and Jurassic Brachiopoda, 

 for which a considerable quantity of materials has accumulated. 



We should be very unmindful of our great obligations to the 

 Honorary Secretary, the Eev. Thomas Wiltshire, M.A., F.G.S., did 

 we omit to call attention to the fact that there is an admirable index 

 to the Three Volumes of Brachiopoda, occupying forty-three pages, 

 most carefully prepared by him, and giving, not only the page to 

 each species, but a cross reference to every synonym referred to in 

 the text of the entire work. 



4. Mr. Searles Y. Wood adds a third part to the Eocene Bivalves. 

 EecoUecting that the Palseontographical Society took its rise in the 

 " London Clay Club," and that Mr. Searles Wood was one of its 

 members, we cannot but rejoice to see so venerable an officer of the 

 Society still actively contributing to its publications. The present 

 Part contains figures and descriptions of the following genera, 

 namely, Verticordia, Cardita, Astarte, Woodia, Grassatella, and 

 Chama. 



5. Professor Owen concludes this volume with a Monograph on 

 the Fossil Mammals of the Mesozoic Eocks, the materials for which 

 he has long been accmulating and the interest in which has by no 

 means abated. 



The first pages of this work are devoted to a consideration of the 

 Eheetic Mammals of the genus Microlestes, in which the author 

 places the detached tooth of Hypsiprimnopsis rhceticiis discovered 

 by Mr. Boyd-Dawkins at Watchet, Somerset, and also the re- 

 markably rich series of detached teeth discovered by Mr. Charles 

 Moore, F.G.S., of Bath, in a fissure of the Mountain Limestone at 

 Holwell, Frome, Somersetshire. Then follow the Mammalia from 

 the Stonesfield Slate of the genera Ampliitherium, Phascolotherium, 

 and StereognatJius, comprising four species. 



The remainder of the work is occupied by the consideration and 

 description of the Purbeck Mammalia, which (with the exception 

 of Spalacotlieriuum tricuspidens, Owen, discovered, in 1854, by 

 Messrs. Wilcox and Brodie, of Swanage) were all brought to light 



VOL. VIII. — NO. LXXXII. ^ 12 



