276 Revieivs — F. Itutley^s Granites and Greenstones. 



Hylerpeton, FritscMa (gen. nov.), Amblyodon, Sparodus, Dendrerpeton, 

 Baphetes, Flatystegos (gen. nov.). Also Eosaurus, of uncertain 

 alliance ; and two genera known from foot-prints only, Sauropus 

 and Hylopus. 



Of group No. 2 there are Grcsophoniis, a pedipalp ; Mazonia and 

 PalcBophomis, belonging to the Eoscorpioidae ; and Eurypterella, 

 Amphipeltis, and another, of uncertain position. Xylobius, Arcliiulus, 

 Amynilyspes, and EvpJwberia are Myriapods ; and Palaiocampa, 

 Eileticiis, and Ilyodes are more or less related to them. The 

 Insects comprise Archimylacris, Mylacris, Petroblattina, Platephemera, 

 Lithentomum, Homothetus, Xenoneiira, Haplophlebiiim, Gerepliemera, 

 Dyscritiis, and Archceoscolex. 



Of group No. 3 there are Pupa (Dendropnpa) , Strophia (StropJiella), 

 and Zonites (Connliis). 



The author adds an interesting account of two fossiliferous tree- 

 stumps lately observed by Mr. P. W. McNaughton at the Joggins 

 coal-mine (pp. 84, 85) ; also a Note on the Devonian plant-beds 

 at St. John, New Brunswick ; and he gives some very useful 

 suggestions for collectors. 



II. — Granites and Greenstones. A series of Tables and Notes 

 for Students of Petrology. By Frank Eutley, F.G.S. 



ME. EUTLEY has done very good service by publishing this 

 unpretentious little volume, a compendium of petrology, 

 containing a very great amount of useful information in small bulk 

 and convenient form. A glance at the interior of the book, with 

 its long list of species and varieties of rocks, and compact table of 

 minerals, will at once dispel any qualms which the associations 

 of the title may not improbably stir, for it is at once evident that 

 Mr. Eutley has no desire to recur to the period when everything 

 was either a granite or a greenstone. He, however, thinks, and 

 quite rightly, that the use of such terms by geologists in the field 

 w^ould often save errors which creep in when more exact determina- 

 tion is attempted without microscopic aid. 



After indexing the symbols to be employed, the author at once 

 gives us a table of rocks, which is clearly intended to be exhaustive, 

 and to contain all the most important rock types. We notice a few 

 omissions, such as some terms recently employed by Brcigger, which 

 seem to be of equal importance with others admitted to the table ; 

 nor is it quite clear why borolanite is placed with the dyke rocks 

 rather than with the nepheline-syenites. The table depends on 

 chemical composition, mineral constitution, sti'ucture, and to some 

 extent on genetic relationship, and is probably as clear as in the 

 present state of our knowledge it could be made. 



Definitions of rock structures follow, but, unfortunately, they are 

 not arranged even alphabetically, a defect to some extent atoned for 

 by an index. Then the rocks themselves are defined, the unaltered 

 rocks being placed by themselves and followed by the altered rocks ; 

 the felsites are considered in each division, while the porphy rites, 



