68 Bibliographical Notices. 



and receives only the clathrated forms C. rhomhea and C. decussata, 

 while the remaining section is placed in Modiolana, Beck. Similarly 

 Lucina has been divided, and its species distributed among the genera 

 Loripes, Poli, Lucina, Brug., and Axinus, J. Sow. These changes 

 appear to be for the better ; but we are at a loss to understand why 

 the same author who adopts these genera unites Modiola with My- 

 tilus, Artemis and Cytherea with Venus, and Syndosmya with Scro- 

 hicularia ; for the four genera which he condemns are founded 

 upon equally valid grounds with those which he adopts. 



There are two changes in specific nomenclature which appear 

 especially to call for remark. The English Pinna, which has already 

 been so frequently renamed, comes before us once more with a new 

 title, as Pinna rudis. The author has given us no reason for the 

 adoption of this name, which is remarkable, since another species 

 has hitherto been considered to be the Pinna rudis of Linnaeus. 

 Venus Gallina, Linn., is adopted instead of V. striatula, D'Orb.; 

 but Mr. M 'Andrew has found these two species in company on 

 several parts of the Spanish coast, each preserving its distinctive 

 characters. Indeed the form of V. striatula from the same localities 

 in which V. Gallina is found shows a greater divergence from that 

 species than do the majority of examples of the same species as 

 collected on our own coast. 



We have now freely handled the second volume of ' British 

 Conchology,' and called attention to points on which we are compelled 

 to dissent from certain views which the author has adopted. Mr. 

 JeflFreys can afford to challenge such criticisms. Indeed we have 

 seen that he anticipated them. His work has too much sterling 

 merit in it for him to fear the discovery of a few subjects of difference 

 between the opinions of himself and those of his brethren of the 

 dredge. We rejoice that a large class of persons who have hitherto 

 been debarred from pursuing conchology by the expensive nature of 

 the only descriptive work on the subject will now find a standard 

 authority brought within their reach ; while no experienced concho- 

 logist will be able to dispense with Mr. Jeffreys's work, or to take it 

 up without finding its pages full of new and interesting matter. 



The School-Manual of Geology. By J. Beete Jukes, M.A., 



F.R.S. &c. Edinburgh, 1863. 362 pages. 

 A Guide to Geology. By John Phillips, M.A., LL.D., F.R.S. 



&c. 5th edition. London, 1864. 314 pages. 



Both of the authors of the hand-books before us have supplied 

 students with larger manuals, full of sound information in the chief 

 branches of geology ; and these more complete works have passed 

 into two or more editions, keeping up with the progress of the 

 science. Here, then, we have geologists, of great experience and 

 good culture, expounding and illustrating the elements of their fa- 

 vourite science, at large for advanced and special students, and in a 

 less elaborate manner for the amateur and the beginner. This is as 

 it should be. There are differences, however, in these little text- 



