Reviews — Barrois on the Upper Cretaceous Beds. 513 



action. It is true, as they observe, tliat we have no proof that the 

 animals of a zone in one locality were coeval with those of the same 

 zone in another, though the succession may be the same. Never- 

 theless, whatever inte^Dretation we put upon the facts, they remain 

 of great interest. Their determination requires long and patient 

 research, and has an important bearing upon the development of 

 life ; but we cannot help remarking upon the fact that the zones 

 adopted by Messrs. Tate and Blake differ considerably from those 

 determined by Dr. Wright in the south-west of England, while the 

 palseontological line between the Lower and Middle Lias, always 

 the most unsatisfactory of geological divisions, differs considerably 

 from that taken by Mr. Judd in the Midland district. 



Part II. is devoted to Palseontology proper, or the description of 

 the Liassic fossils of Yorkshire. Each author has here devoted 

 himself to particular portions of the work. Mr, Blake describes 

 the Eeptiles, Fishes, Cephalopods, Insects, Crustacea, Echinoderms, 

 Actinozoa, Porifera, and Foraminifera ; while Mr. Tate has given 

 his attention to the other Mollusca, the Annelides, and the Plants. 

 The new species and some others are figured in the nineteen plates of 

 fossils which accompany this volume. Mr. Blake has treated the 

 Ammonites as a family, and adopted the German method of splitting 

 np the series into genera under distinct names, a plan which cer- 

 tainly does not seem to us to confer a benefit upon the student, who 

 would gladly have less names to remember by the amalgamation of 

 species and genera. 



The volume is a valuable contribution to geological literature, 

 and reflects every credit upon its painstaking authors. 



IV. — Eecheiiches sur le Terrain Cretace Superieur de l'An- 

 GLETERRE ET DE lTrlande. Par Charles Barrois, D.Sc. 



(Lille, 1876.) 



IN a Memoir of more than 200 pages, accompanied by a coloured 

 map and sections, Dr. Barrois has given us the result of his 

 researches on the Upper Cretaceous series of England and Ire- 

 land. Many valuable papers on the White Chalk have appeared by 

 Mantell, Phillips. Woodward, God win -Austen, Meyer, C. Evans, 

 Whitaker, and others in England ; Hebert, Mercey, De Lapparent, 

 Potier and D'Archiac in France ; but no general and elaborate 

 resume has, we believe, appeared on the subject. Prof. Hebert has, 

 however, given his views of the classification of the Upper Chalk in 

 a paper read before the French Geological Society ; ^ and has also 

 compared the Palasontological Zones of the Dover Chalk with the 

 divisions of the Chalk in the Paris basin. The object of the work 

 by Dr. Barrois is to trace from an examination of the coast, as well 

 as inland sections, both the Lithological and Stratigraphical as also 

 the Palasontological characters of the Upper Chalk (Cenomanien, 

 Turonien, and Senonien) of England and Ireland ; from which it 



1 Bull. Soc. Geol. France, 3 ser. t. iii.. p. 595 ; t. ii. p. 416; ibid 2 ser. t. xx. 

 p. 605 ; t. xvi. p. 149 ; t. xxix. p. 453. 



DECADE II. — VOL. Ill, — NO. XI. 33 



