Revieics — The Water Supply of Camhridgeshire. 277 



The study of the fossil faunas of the Caribbean region is of 

 fundamental importance for the correlation of the Tertiary deposits 

 of both the Atlaatic and Pacific basins, because of the inter-oceanic 

 connexion across Central America which existed during a con- 

 siderable part of the Tertiary period. It has long been noticed 

 that the fossils in the Tertiary deposits of the West Indies and 

 Central America are more nearly allied to species living in the 

 Indo-Pacifiu region than to those in the Atlantic. In recent years 

 the work of numerous American writers has considerably extended 

 our knowledge of these resemblances, especially in the Calcareous 

 Algae, Foraminifera, Corals, Echinoids, Mollusca, and Crustacea. 

 It has been shown that many species or genera which are abundant 

 in the Eocene and Oligocene deposits of the Caribbean region are 

 now extract in the Atlantic, but have representatives in the Pacific. 

 At the present day the Atlantic fauna is in many respects strikingly 

 different from that of the Indo-Pacific region, but the two faunas 

 were not differentiated from one another in Oligocene times and 

 were only slightly differentiated in the Miocene period. 



Except in Trinidad no Lower Eocene is known in Central America 

 and the AVest Indies, and Middle Eocene is known only in Panama, 

 but Upper Eocene deposits are widely distributed and rest on folded 

 and eroded Upper Cretaceous. The Upper Eocene, of which the 

 type formation is the St. Bartholomew Limestone, sho^vs close 

 relationship with the Priabona formation of Northern Italy. 

 Similarly, the coral fauna of the Middle Oligocene deposits bears 

 close resemblance to that of the Rupelian of Xorthem Italy. 



The AVater Supply of Cambridgeshire, etc., from Uxder- 

 GROCXB Sources. By W. Whitaker, B.A., F.E.S. Mem. 

 Geol. Survey, (His Majesty's Stationery Office). 157 pp. Price 

 75. net. 



THE publication of this interesting and authentic record of the 

 underground water supplies of Cambridgeshire, Hunts, and 

 Rutlaad, has been looked fonv'ard to by those interested in providing 

 aji adequate water supply to meet the conditions accentuated by 

 the abnormal drought of last year. 



The area covered by the work embraces that part of England 

 where the least rainfall is recorded in normal years. 



The recent drought, particularly in the Fens, where the domestic 

 water supply is most difficult to obtain, has compelled the local 

 authorities to look seriously into the question of permanent water 

 supplies. 



In publishing the work at this time the author may be assured of 

 its appreciation by those vcho desire to be informed of the best means 

 of improving and enlarging their existing supplies. 



The first part of the book deals with the general Geological 

 Formations, Water Bearing Beds. Springs, and Contamination ; 



