﻿Reviews — Prof. Gossekfs Coiirs Elementaire de Geologie. 33 



Bostricliopus antiquiis, Goldf. The only known and wonderfully 

 perfect example of wliich was found in the Fosidonomya schists or 

 Culm near Herborn in Nassau, and is preserved in the Bonn 

 Museum. 



Lying before us is another work of Professor Ferd. Eoemer's/ 

 published several years ago, with all the advantages that can be de- 

 rived from fine paper, good printing, and beautifully finished plates. 

 It is a handsome quarto monograph of the Fossil Fauna of the 

 Silurian Drift of Sadewitz in Lower Silesia. It would seem absurd 

 to compare the eight splendid plates which illustrate it with those of 

 the " Lethfea," but an examination of both will show how thoroughly 

 they are adapted to their respective objects, and if the latter appear 

 rough and ready by the side of the former, they will lose none of 

 their value on that account. 



This Sadewitz Monograph is quite a palasontological and geolo- 

 gical curiosity, being the description of a fauna from unknown 

 beds, the fossils forming which were all collected from Drift 

 deposits. Seventy-three species are enumerated, including twenty- 

 five new ones, and a careful studj' of the group of organisms thus 

 brought together, and of the lithological character of the original 

 matrix still associated with the specimens, led the author to hazard 

 the suggestion that the Silurian rocks which once contained them 

 are to be sought in the Eastern Eussian provinces, either in 

 Esthonia or still under the sea in the neighboi;rhood. 



Among the species figured some splendid sponges are very notice- 

 able ; such as, Aulocopium diadema, Osw. ; A. aurantium, Osw. ; 

 A. hemisphcBricum, Roem. ; Astylospongia tncisa, Roem., etc., etc. 



The position of the Lyckholm beds in Esthonia, which seem to be 

 the most likely horizon whence these fossils were derived is towards 

 the top of the Lower Silurian, between the Wesenberg beds (below) 

 and the Borkholm beds. G. A. L. 



III. CODRS ELEMENTAIRE BE GeoLOGIE 1 l'uSAGE DE l'eNSEIGNE- 



MENT SECONDAIRE CLASSIQUE ET DK l'eNSETGNEMENT SEOONDAIRE 



SPECIAL." By Prof. J. Gosselet. (Paris, 1876.) 



THIS little book of not quite 200 pages is expressly written for 

 the use of beginners, but self-teaching by its aid is not contem- 

 plated, the knowledge which it imparts being intended to be supple- 

 mented by the Professors in the French Lycees. This the author 

 explains in his Preface, in which he notes the difficulty (greater in 

 France than in England) of giving public-school boys instruction in 

 out-door geology. Fortunately for his pupils. Prof. Gosselet is him- 

 self an enthusiastic field geologist, and we are not surprised to see 

 that he very justly compares the necessity for field-work in learning- 

 geology to that of laboratory-work as regards chemistry. 



In order to give learners an idea of succession in time, the writer 

 compares the geological divisions to the reigns in which historical 



^ " Die fossile Fauna der Silurischen Diluvial-Gescliiebe von Sadewitz bei Oels 

 in Nieder-Schlesien." By Dr. Ferd. Koemer. 4to. Breslau, 1861. 



DECADE II. — VOL. IV. — KO. I. 3 



