176 Reviewa — Cretaceous Bocks of Britain. 



or two, renders it an extremely rlifficult task to fix the dividing 

 lines between the two zones and between the Middle and Upper 

 Chalk. Fnrtlier research in this distinct will no doubt throw 

 additional light upon this subject and help to solve some of the still 

 doubtful problems respecting the Lincolnshire Chalk. 



All the fossils referred to in this article have been examined and 

 named by Mr. Jukes-Browne, to whom I am in many ways greatly 

 indebted for advice and assistance. 



CLASSIFIED LIST OF FOSSILS. 



Lamellibranchiata. 



Inoceramus Ciwieri, Sby. Plicafiila siffilUna, "Wootlw. 



,, Brongniarti, Sby. Scptifer lincatus, Goldf. 



,, (an imuamecl species). Ostrca vesicu/uris, ham. 

 sp. ,, vormainaita, d'Orb. 



Spoiidi/Jiis latits, Sby. ,, sp. 



BitAcnioroDA. 

 JRhyiulLoucUa Ciirieri, d'Orb. Kbigena lima, Detr. 



,, llmhata, Schlotb. Tercbratnla carnea, Sby. 



,, reedensis, Etb. Terehratuliiia lata, Eth. 



,, octo'plieata, Sby. Magas pumilus, Sby. 



ECHIN ODERMAT A . 



Ilicraster Leskci, Desm. Holaster platms, Maut. 



,, cortestudinariitm, Goldf. ,, placenta, Ag. 



, , sp. Anunchgtes scutatus, Leske. 



Cyphosoma, sp. Cklaris sceptifera, Mant. 

 Goniastfr, sp. ,, perornata, Forbes. 



JnftihiKfer exccnfricus, Forbes. ,, sp. 



Annelida. 

 Serpnla, sp. (small spii-al). 



ACTINOZOA. 



I'arasnnlia centralis, Maut. 



^^ IE vi E "w s. 



I. — Memoirs of the Geological Survey or the United 

 Kingdom. 



The Ceetaoeous Eocks of Britain. Vol. II : The Lower and 

 Middle Chalk of England. By A. J. Jukes-Browne, with 

 contributions by William Hill. 8vo ; pp. xiii, 568, map, 

 8 plates, illustrated. (London, 1903. Price 10s.) 



rpHE first volume of this series of memoirs on the Cretaceous 

 X Rocks was reviewed at considerable length in the Geological 

 Magazine for February, 1901. In that review some idea of the 

 plan of the work was given, and it will now only be necessar3' to 

 sketch the contents of the present volume, which brings the subject- 

 matter up to the zone of Terebratuh'nn gracilis in the White Chalk. 



The volume opens with a general account of the Chalk as a whole 

 and a history of its subdivision into parts ; an account of considerable 



