Reviews — LyclVs Principles of Geology* 569 



those sent to the Cornish Museum, and figured by me in the Geolo- 

 gical Transactions of Cornwall, for 1848, at PL iii. Fig. 2: it is so 

 much like the outer part of an Aster olepis, or Coccosteus, that the late 

 Hugh Miller, on seeing it, said, " had he found it in Caithness or 

 Cromarty, he should without hesitation have considered it as belong- 

 ing to 6ne of those fishes." Strong testimony this. I have lately 

 seen the paper of Mr. E. Kay Lankester, in Vol. xxi. of the Palaeon- 

 tological Society, and by the figures and descriptions there given, I 

 am the more convinced of the Piscine nature of the Cornish fossils, 

 and farther, that they will prove to belong to some of the families 

 described there. The Cornish ones are ver}/ much larger, and con- 

 sequently may prove new species. Eoused by the new state of 

 affairs, I hav^e turned out the contents of a \)QK, packed twenty years 

 ago on leaving Cornwall, and up to that time untouched. Here I 

 found a splendid cephalic shield. It is a little more than six inches 

 in length, unfortunately not perfect. I have as well some nice but 

 fragmentary specimens of scales and spines, all beautifully marked — 

 these are merely a few odds and ends left after my collection was 

 placed in the Geological Museum at Penzance. If these specimens 

 were examined carefully, they would be found to throw a great deal 

 of light on the subject, especially the spines. I greatly regret that I 

 cannot go there to do it myself. 



I^:El•\^I:E]"ws. 



I. — Principles of Geology; or, the Modern Changes of the Earth 

 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 volumes. Vol. II. Illustrated with Maps, 

 Plates, and Woodcuts. 8vo. pp. 649. London : John Murray. 

 1868. 



IN the Geological Magazine for 1867, Vol. IV. p. 120, we gave a 

 brief notice of the new edition of the first volume of this grand 

 work. 



Great and important as had been the alterations in Volume I., we 

 cannot but think that the second volume is by far the most valuable, 

 both as to its matter and the treatment it has received from the author. 



The following account of some of the principal additions to this 

 volume will enable the reader to see how much labour has been be- 

 stowed upon the new edition. Much new information has been 

 added to the chapter on Mount Etna, in consequence of the author's 

 re-examination of this volcano in 1857 and 1858. The theory of a 

 double axis of eruption is explained (p. 9), and the changes in the 

 scenery of the Val del Bove, caused by the lavas of 1852, are de- 

 scribed (p. 31). The solid texture and steep original inclination of 

 certain lavas of known date are also pointed out (pp. 35 and 36), 

 and the relation of some ancient valleys on Etna to the former struc- 

 ture of the mountain is considered (p. 40). 



An account is given (at p. 69) of the changes produced by the 



VOL. v.— NO. LIV. 37 



