380 Leonhard and Geinitz's " Neues JahrhuchP 



tlie reception of tlie Pleuracanthini, equivalent to the Ch'mcerini, 

 Squatini, Baiim, and Acanthodini. There are, perhaps, also some 

 points of relationship between the last-named tribe and another type, 

 verging on the Teleostei [^Ganoidei'], but as Professor Huxley has 

 argued, perhaps they are best arranged with the Chondrojpteri and 

 the Pleuracanthim. At least I would not advise other naturalists of 

 the Darwinian school, to which Professor Kner evidently belongs, to 

 build too many developmental hypotheses on this somewhat doubtful 

 " Proto-Siliirus.^' I fear there is not strength enough in its back to 

 support them ! Whichever opinion as to its systematic position be 

 ultimately adopted, the author's merits are not thereby diminished ; he 

 has certainly filled up a hitherto very long-felt vacancy, and Palas- 

 ichthyology has made a positive advance in the publication of 

 Professor Kner's paper on Xenacanthiis Decheni, not on any account 

 to be underrated, and we heartily recommend it to the attention of 

 Zoologists, Palaeontologists, and Geologists. 



III. — Leonhakd und Geinitz^'s " Neues Jahrbuch fur Mineralogie, 

 Geologie, und Palaontologie." Jahrgang, 1867. Hefte I-V. 



THIS excellent monthly periodical of Geology and Mineralogy 

 well supports the reputation it has long possessed as 

 Leonhard and Bronn's Jahrbuch. The original articles are well 

 selected, always of considerable interest and often of great value; 

 the letters to the Editors, with news of fresh discoveries in fossils, 

 minerals, and geological research, are always worth looking at ; the 

 catalogue of new books, ^vith a notice of the geological contents of 

 periodicals, is an important bibliographic feature ; and the numerous 

 ooncise and careful abstracts of books, pamphlets, and papers, classi- 

 fied under Mineralogy, Geology, and Palaeontology are always 

 acceptable to those who wish to know what is being thought, 

 written, and done in these branches of science. 



The five Numbers for the earlier portion of 1867, now before us, 

 supply a fair sample of the result of researches carried on by our 

 German brethren. For Mineralogy, we have Kenngott treating of 

 Natrolite (p. 77), and on the alkaline reaction of several minerals 

 (pp. 302-313 and 429-441): zeolites, talc, felspars, augite, mica, 

 spinel, olivine, celestine, chlorite, tourmaline, epidote, etc. ; G. 

 Werner on the significance of the contours of crystal faces, and their 

 reference to the relations of symmetry in the crystallographic 

 systems (p. 129) ; at p. 159 Liehe gives the particulars of a metallic 

 mineral from Atacama, consisting chiefly of iodine and lead. This 

 " Jodblei" gave, on analysis, — • 



Antimony 0.77 



Carbonic Acid 0.31 



Sulphate of Lead 5-51 



Chlorine 2.91 



Iodine 17.01 



Lead 73.01 



99.52 



Its origin is suggested as having been due, first to the oxidization of 

 galena, followed by decomposition and rearrangement, arising from 

 the action of alkaline mineral waters carrying iodine. To those 



