Reviews — Nicholson and Lydekker's Palaeontology. 127 



Fossils from the Lower, Greensand, Millbrook, Beds. 

 Sphterodus neocomensis. 

 Pycnodont, teeth (young). 

 Acrodus reticulatus. 

 Aster acanthus? dorsal spine, incomplete. 



Ichthyosaurus \ 



Dakosaunis ? I teeth, some derived from 



Polyptychodon I the Oxford Clay. 



Pleswsaurus J 



An undescribed tooth, thought by Mr. E. T. Newton to be Eeptilian. 



Fossils from Ampthill, Beds. 

 Limestone Bands. 



Ostrea gregaria, Sby. 

 Trigonia irregularis ? Seebach. 

 A/aria trijida, Phil. 



Oxford Clay. 



Belemnites Owenii, Pratt. 



Cidaris jiorigemma , Phil. 

 Exogyra nana, Sby. 

 Pinna lanceolata, Sby. 



Pentacrinus. 

 Cidaris Smithii, Wright. 

 Serpula tricar inata ? Sby. 

 Shynchonella various, Schloth. 

 Gryphea dilatata. 

 Belemnites hastatus. Blain. 

 ,, sulcalits, Mill. 



Ammonites cordatus, Sby. 



,, plieatilis, Sby. 



,, athletus, Sby. 



,, biplex, Sby. 



,, near Toucasianus, d'Orb. 



Ichthyosaurus. 



REVIEWS. 



I. — A Manual of Paleontology for the Use of Students, with 

 a General Introduction on thk Principles of Palaeontology. 

 By Henry Alleyne Nicholson, M.D., D.Sc, F.G.S., etc., Regius 

 Professor of Natural History in the University of Aberdeen, 

 and Richard Lydekker, B.A., F.G.S., etc. Third Edition. 

 Re-written and greatly enlarged. In Two Vols. Royal 8vo. 

 pp. 1624, with 1419 Woodcut Illustrations. (William Black- 

 wood & Sons, Edinburgh and London, 1889.) 

 (Continued from page 87.) 



IN a work undertaken by two or more authors, it is always difficult 

 to secure uniformity of treatment ; and a few striking differences 

 are observable in the two volumes before us. As already remarked, 

 while the microscopical characters of all the principal skeletal tissues 



