430 Hcn'eirs — Prof. Tornquisf — On the BqyrionidcB. 



had to be made for description, Avliile others are referred to by name 

 only. The author has endeavoured to carry out, what shouhl be the 

 leading aim of palaeontology, a natural sj^stem corresponding to 

 morphological and phylogenetical facts. Fossils are regarded chiefly 

 in their relations as members of the animal kingdom, rather than 

 from the geological standpoint as fui'nishing evidence of the com- 

 parative age of the bed^ in which they are inclosed ; but their 

 significance in this latter respect has by no means been neglected, 

 and the geologist will tind the characteristically leading fossils of 

 the different rock formations amply described and figured. 



A special featux'e of this volume is the unusual number and 

 excellence of the illustrations, which adorn nearly every page; not 

 only has full use been made of the cliches of the remarkably clear 

 ■woodcuts of the '• Handbuch," but there are in addition numerous 

 fresh figures, so that a typical form of nearl}^ every fossil genus of 

 importance has been represented. 



In an introductory chapter, after an explanation of the conception 

 and object of the science of Palaeontology, refei'ence is made to the 

 chemical and mechanical changes which take place in organic remains 

 in the process of fossilization, and this is Ibllowed by an instructive 

 and spirited exposition of the relations of Palaeontology to each 

 of the sister sciences of Biology, Geology, Physical Geography, 

 Embiyology, and Phylogeny, and the essential importance and 

 value of the facts contributed by Paleeontology to these respective 

 sciences is very forcibly elucidated. 



It would lead beyond the bounds of our space to refer in any 

 detail to the numerous alterations and additions which have been 

 introduced in the systematic portion of the present work, in com- 

 parison with that of the "Handbuch": these mainly concern, as 

 might be supposed, the division of the Invertebrata. It will suffice 

 to state, however, that the results of the most recent investigations 

 of specialists and others in the vario as groups of fossils have been 

 criticall}'' noted and incorporated in this book, thus rendering it 

 Taluable as a reference to the experienced palaeontologist as well 

 as to the student-beginner in the science. 



As additional recommendations, the letterpress is clear, the book 

 is strongly bound, and it is brought out by the publishers at a very 

 moderate price. 



JII. — Observations on the Stkucturk of some Diprionid-e. By 



St. Leosk. Tornquist. Trans. Eoy. Swedish Ply^siographical 



Soc, 1892-93. 



rjlHE author in this paper describes the structure of CUmacograptus 



I scalaris (Lin.), C. inteniexas (Tornq,), Diploijrajytns palmeus 



(Barr.), D. beUuIus (Tornq.), and Cephalograptus cometa (Geinitz). 



His method of preparation consists in grinding down specimens 



preserved in iron pyrites until the required section is obtained. For 



purposes of description he divides the thecfe of the polypary into 



two series: (a) primordial, containing the first theca; (6) second 



series. 



