137 



la IE ^^ I E ^w s. 



I. — -A MOT<rOGRAPH OF THE SlLURIAN FoSSILS OF THE GiRVAJT 



District in Ayrshire. By H. A. Nicholson, and R. Ethkridge, 

 jun. Fasc. III. 8vo. pp. i.-vi., 237 — 341, and Plates xvi— 

 xxiv. (London and Edinburgh, Blackwood, & Co., 1880.) 



BESIDES descriptions of SerpuUtes and various so-called Worm- 

 tracks (wliich are here carefully treated as having been pro- 

 bably due to Crustaceans and other creeping and burrowing animals 

 besides Worms), the Asteroid and Crinoid Echinodermata, found in 

 the Silurian rocks of Girvan, are published in this Part of Nicholson 

 and Etheridge's excellent Monogi'aph. It contains also some of the 

 intended Supplements descriptive of (1.) Clathrodictijon and Hyalo- 

 nema (?), but why the latter should be regarded as a Rhizopod is 

 not clear; (2.) Heliolites, Plasmapora, Propora, Pinacopora, Haly- 

 sites, and Favosites, among the Tabulate Corals ; (3.) Staurocephalus, 

 Cydopyge, Trinucleus, Dionide, and Agnostus, among the Crustacea ; 

 with (4.) the cirripedal Turrilepas. See also Geol. Mag. No. 177, p. 

 135 ; and No. 189, p. 139. 



These additions are chiefly based on a large amount of new 

 material collected by Mrs. Gray and others in the Girvan district ; 

 and are partly due to information accruing in the course of the work. 



The printing- and paper are of the first quality, and the plates are 

 also good. An index to the first volume, now completed, is given in 

 this Fasciculus ; and great credit is due to the authors for these good 

 results of their persistent and enthusiastic labour, supported by a 

 Eoyal Society Government Gi^ant. 



XL — Revue de Geologie, potjr les annees 1877 et 1878. Par 

 MM. Delesse et De Lapparent. (Paris, F. Savy, 1880.) 



FROM the preface to the sixteenth volume, it would appear that 

 this useful publication will now be brought to a close. During 

 sixteen years, under the able editorship of M. Delesse associated with 

 M. Langel in the first three numbers, and with M. de Lapparent in 

 the continuation (vols. 4 to 16), this work has contained a concise 

 account of the contents of the numerous papers connected with 

 geology, and the allied sciences, during that period. The present 

 volume records the progress of geology during the years 1877-78, 

 and like the preceding ones, the subjects are arranged under five 

 heads : Physiographic, Lithological, Historical, Geographic, and 

 Dynamic Geology. 



Among the various papers collated, special attention has been 

 given to the new researches on litholpgy, metamorphism and the 

 analysis of rocks, as also to agricultural geology. The sixteen 

 volumes will form a very important, if not an indispensable work 

 of reference for the geologist, in which the authors have endeavoured 

 to continue the useful work of M. d'Archiac, by giving, year by 

 year, the principal facts bearing on the progress of the science. 



J. M. 



