416 Revieius — The FalceontograjjJiical Society. 



outcrops of the successive boundaries will be in parallelism with, 

 the lines on the map. To take the case of the small area where 

 the Chalk surface is composed of the Ostrea hmata zone, Professor 

 Boswell has estimated^ the maximum thickness of this zone before 

 it is overlain by Eocene deposits to be between 70 and 80 feet. 

 Consequently, on our mnp, the boundary between this zone and that 

 of Belemnitella mucronata will occupy a position between the 1,250 

 and 1,300 lines. Similarly, adopting Professor Boswell's estimate of 

 240 feet as the thickness of the B. mucronata zone at the point 

 where the Eocene comes on, this will bring the position of its lower 

 boundary on our map between the 1,000 and 1,050 lines. In the 

 same way, assuming the estimated thickness of about 135 feet for 

 the Actinocamax quadratus zone, its lower boundary will coincide 

 roughly with our 900 line; that of the Marsupites zone, if its 

 thickness is between 60 and 70 feet, as Professor Boswell estimates, 

 will occur somewhat to the east of our 800 line ; and that of the 

 Micraster coranguinum zone, if its thickness is 210 feet, will occur 

 a little to the east of our 600 line. The insertion of these zonal 

 boundary-lines on the map brings out well the unconformities 

 between the Eocene and Chalk and Pliocene and Chalk respectively, 

 but particularly that of the former, since the Eocene is seen 

 transgressing from Ostrea lunata Chalk in the north, across 

 B. mucronata Chalk, on to A. quadratus Chalk in the south. 



Iramediatejly to the south of the area under present discussion there 

 occurs a notable disturbance of the Chalk, but the consideration of 

 this feature lies outside the scope of the present brief paper. 



E,E^s7"IE3^W^S. 



I. — The Pal^ontographical Society. 



rpHIS Society has just issued, for 1916, its seventieth volume 

 X (dated February, 1918), containing: — 



1. The Weald en and Pdkbeck Fishes. Part II. By 

 Dr. A. S. Woodward, F.P.S. pp. 49, with 10 plates- and 

 14 text-figures. 



2. The Pliocene Molltjsca. Part III. By F. W. Harmer, 

 F.Gr.S., etc. pp. 159, with 12 plates. 



3. The Paleozoic Asteeozoa. Part III. By W. K. Spencee, 

 M.A.., F.G.S. pp. 59, with 8 plates and 48 text-figures. 



4. British Graptolites. Part XI. By Miss Elles, Sc.D., 

 and Miss Wood (Mrs. Shakespear), D.Sc. Edited by Professor 

 Lapworth, LL.D., F.E/.S. pp. 60, with title-page and index. 



The volume before us, literally produced "amidst war's alarms " 

 (for the premises of Messrs. Adlard & Son, the printers, were upon 

 one occasion bombed by an enemy aeroplane), displays neither in the 

 quantity of its contributions nor their quality in authorship, illustra- 

 tions, printed matter, or paper any deterioration as compared with 



^ Boswell, " Notes on the Chalk of Suffolk " : Journ. Ipswich and District 

 Field Club, vol. iv, pp. 17-26, 1913. 



