BihUograpli'ical Notices. 473 



published^ excepting that SowerbV;, in tlie original diagnosis''^, 

 mentions that it is testaceous. It is white, glossy, and 

 slightly concave externally, with a groove and a ridge 

 parallel with the outer curved margin, whilst the straight or 

 columellar side is finely serrate. Parallel with the curved 

 outline may be noticed numerous faint subpellucid lines 

 Avhich arise between the denticles on the serrated edge. 



[To be continued.] 



BlBLIOGRArHICAL NOTICES. 



Memoirs of the Geolof/ical Survei/ of iJie United Kiiujdom. — Tlie 

 Cretaceous Bocks of Britain. Vol. III. The Upper Challc of 

 Enrjland. 13y A. J. Jukes-Browne. "With Contributions by 

 AViLLiAM Hill, F.G.S. 8vo. Pp. x and 50G. AVith 79 Ilhis- 

 tratious in the text and 1 Plate. 1904. E. Stanford, London ; 

 J. Menzics, Edinburgh ; and Hodges & Co., Dublin. Price 10i\ 



As in the case of Vol. II. of this work (noticed in the Ann. & Mag. 

 Nat. Hist, for February 1904), the Board of Agriculture and 

 Fisheries, desirous that agriculturalists and others should have full 

 benefit, has distributed this volume also for review. 



The Memoirs of the Geological Survey of the United Kingdom 

 always bring together much valuable material, and this volume is 

 in no w-ay wanting in this respect. The Upper Chalk is defined by 

 the authors as consisting of the zoues of Uolasier jilarms, Micraster 

 cor-testudinariiim , Micraster cor-anguiimm, Marsupites, Actinocci»ia,v 

 (juadratus, Bdemnitella mucroiiata, and Ostrea lunata. The zonal 

 divisions of the Chalk are fully recognized in this volume, although 

 the authors seem reluctant to part with the obsolete divisions of 

 " Upper," " Middle," and " Lower," which have now such small 

 significance. They also seem to hanker after a fresh system of 

 zonal nomenclature (p. 5), but this seems to us to be unnecessarj-. 

 In the descriptions of the coast-sections full credit is given to 

 Dr. Howe, who must certainly feel rewarded in reading the generous 

 tribute to his work in the Preface by the Director. Indeed it is 

 quite clear, and is so stated (p. 38), that the publication of Messrs. 

 Kowe and Sherborn's work necessitated the re-writing of those 

 ]tarts of this Memoir which deal with the districts that they have 

 examined; and this is the more clearly brought out at pp. 275-278 

 (" Yorkshire "), if anyone will take the trouble to compare the 

 official account with that recently published by Dr. Rowo in the 

 ' Proceedings ' of the Geologists' Association. It is more and more 

 evident that future work in the field must be conducted by those 

 who have more than a working knowledge of the zoology of the 

 beds which they are surveying, as the exactitude of results achieved 



* Tanlicrville Cat. p. xi. 



