120 Revietos — LyeWs Principles of Geology. 



shell, and its strongly dilated month. And, from the fact that the 

 genus Biicania is so nearly allied to BelleroiyJwn that few Palaeon- 

 tologists regard it as generically distinct, it must be manifest that 

 these three types must go together, wherever we place them. Now 

 as there are no examples, so far as known to the author, of a shell 

 with isolated siphonal openings, except amongst the Prosobranchiate 

 Cephalopoda, — for instance, the Haliotidce, Fissurellidce and Pleuro- 

 tomariad^ — it indicates, for the family, a position near the Fissurellidm 

 and Haliotidcs, and between these groups and the Pleurotomariada. 



E,E"VIE'V7"S. 



1. — Pkinciples of Geology, or the Modeen Changes of the 

 Eakth and its Inhabitants, considered as illustrative of 

 Geology. By Sir Charles Lyell, Bart., M.A., F.E.S. 10th 

 and Entirely Revised Edition. In two vols. Vol. I. Illustrated 

 with Maps, Plates, and Woodcuts. London, John Murray, 1867. 

 F all the Books upon the natural sciences, written within the 

 present century, we may safely affirm that none have had so 

 great an influence upon any particular subject as has Sir Charles 

 Lyell's " Principles " upon the progress of geology. 



In evidence of the avidity with which the teachings of this great 

 master have been received, we need only state that from its first 

 appearance in January 1830, to June 1853, the " Principles of Geo- 

 logy " had run through nine editions, and it had, by 1838, become 

 the parent of another work, now equally well known, "The Ele- 

 ments of Geology." This thriving child of so good a stock arrived 

 last year at its sixth edition. And, this year, Volume I. of its 

 parent's Tenth Edition was cut by many an anxious inquirer after 

 truth. Nor is this all the family with which Sir Charles Lyell's 

 "Principles" has been blest; for, in 1863, he issued another most 

 welcome volume, entitled the " Antiquity of Man," which enjoyed a 

 privilege (shared by few efforts of penmanship, we imagine.) of 

 three editions in one year. Lyell's " Principles " has been so often 

 reviewed, that it is unnecessary to do more than notice some of the 

 more important additions and modifications which one would expect 

 to find in it, as nearly fourteen years have elapsed since the publi- 

 cation of the last edition. That consisted of one volume of 835 

 pages, whereas the first volume of this new edition contains in itself 

 no less than 671 pages. The actual increase, as regards corres- 

 ponding chapters in the last edition is about 275 pages, but a part of 

 this is due to the use of larger type. 



The chapter on the progressive development of organic life has 

 been entirely re-written. In speaking of the introduction of man, 

 the author states that •' little or no progress has been made in dis- 

 covering fossil remains which indicate any inferiority in the cerebral 

 development of man in the paleolithic era." 



A new chapter on the proofs of former vicissitudes in climate, 



