RevieiDS — Hugh MiUer^s Landscape Geology. 473 



outer border being very narrow, truncated and depressed in the 

 centre. Sutural line consisting of two very narrow saddles with 

 an equally narrow sinus between them on the venter, a broadly 

 concave sinus or lobe on each of the sides, and a rather narrow 

 saddle on the dorsum ; siphuncle in the only species known, cylin- 

 drical, exogastric, and placed near the venter or outer and convex 

 margin. Body-chamber long, occupying about one-third of the 

 entire length." 



The author is doubtful as to which of Prof. Hyatt's families the 

 genus should be referred, but he is "inclined to regard it as au 

 extremely aberrant member of the Hercoceratidge." 



The other new genus — Tetragonoceras — is proposed for a loosely 

 coiled shell with a quadrangular transverse section. "Gyrthoceratites " 

 tetrngonus, d'Archiac and de Verneuil, from the Middle Devonian of 

 the Eifel, also has a quadrangular transverse section, but according 

 to Prof. Hyatt's statement, this species, which he places in his genus 

 Centroceras, appears to have been a true close-coiled Nautiloid. 



Of the three new species of Gyroceras, G. Canadense and G. 

 filicinctum are very like the G. Eifelense from the Middle Devonian 

 of the Eifel, while G. submammillatwn bears a most striking resem- 

 blance to an internal cast of the well-known G. ornatum from the 

 same horizon and locality. G. C. C. 



III. — Landscape Geology: a Plea for the Study of Geology by 

 Landscape Painters. By Hugh Miller, of H. M. Geological 

 Survey. 8vo. pp. 63. (Edinburgh and London, William Black- 

 wood and Sons.) 



THE pictures exhibited in the Eoyal Academy have at times been 

 subjected to criticism in the pages of " Nature." The repre- 

 sentation of clouds, waves, the apparent size of the Moon, and the 

 delineation of rock-structure, have in turn undergone praise or 

 stricture ; and it would seem that the unhappy Landscape Artist need 

 make acquaintance with Astronomy and Meteorology, with Geology 

 and Physical Geography, and with Botany and Zoology, if he or she 

 wishes to escape the scientific critic. But the plea of the Artist is 

 that he essays to represent things, not necessarily as they are, but 

 as they appear to him ; and Mr. Briton Riviere (quoted in the work 

 before us) says, "It is the personality of the artist, the impress on 

 the work of the artist's own mind and intention, adequately ex- 

 pressed, which gives the art." Hence, " It is possible for a picture 

 to be scientifically true and have no art at all in it ; and, on the 

 other hand, to contain several scientific blunders, and yet to be a 

 great work of art." 



No one will find fault with the Artist for representing things as 

 they appear to him ; but in pictures that aim to be topographical, it 

 is desirable that the outlines of hill and mountain, of crag or scarp, 

 should bear some relation to the anatomy of the earth. Mr. Miller 

 disclaims any desire to go geologizing through the picture galleries, 

 though he agrees with the critic who says, " Is it too much to ask 

 that the artist shall not give us slate where there is only gneiss, or 

 granite boulders where there are none ? " 



