Geology. 95 



some volume before us, illustrated by its beautiful lithographs and 

 numerous full-page illustrations, several of which are in poly- 

 chrome and most excellently done. Among paleontologists 

 Plates A and B will command attention from being camera 

 drawings by the author that recall his previous illustration of 

 Dictyospongia in Memoir 2 of the same series. 



One hundred pages of letterpress are devoted to an exploita- 

 tion of the geology and physiography of Gaspe, this part being a 

 substantial elaboration of the author's preliminary sketch of the 

 geology of Perce (published in the Report for 1903), and the 

 remainder of the volume consists of a technical discussion of the 

 Gaspe invertebrate faunas. Upwards of 70 new species are 

 described, and the characters of others are redefined. Especial 

 interest attaches to the author's discussion of the origin, distri- 

 bution and relations of Lower Devonic faunas, and the lines of 

 their dispersal and invasion over different areas, this phase of 

 the subject being treated with great ingenuity, and displaying 

 keen philosophical judgment. It is to be noted, for instance, 

 that the origin of the Gaspe sandstone is explained on the theory 

 that it " was an Old Rad lake in the same sense as those of Scot- 

 land and that in which the Oneonta and Catskill sands of New 

 York were laid down." Due prominence is given to the fact that 

 late stages of the Oriskany betray a large percentage of incom- 

 ing migrants which form, as it were, the advance guard of the 

 next organic invasion. Dr. Clarke accordingly concludes that 

 the original determination of the age of the Gaspe beds as prac- 

 tically equivalent to the Oriskany of New York is insufficient, and 

 he is able to trace a passageway by which the Hamilton contin- 

 gent of this fauna entered the region from the Appalachian gulf, 

 moving eastward amid lagoon conditions along the Atlantic 

 border and thence into western Europe. This whole matter is 

 admirably summarized at pages 250-252, and as the work is one 

 that requires to be consulted by all students of the Devonian era, 

 we cannot do better than recommend the reading of this section 

 and others germane to it at first hand. c. r. e. 



2. Publications of the United States Geological Survey. — 

 Recent publications of the U. S. Geological Survey are noted in 

 the following list (continued from vol. xxv, p. 150}: 



Topographic Atlas. — Sixty-five sheets. The sheets, 38 in 

 number, embracing Connecticut with portions of the adjacent 

 States have been collated and bound in a permanent volume 

 which will be of great value to those interested in the region 

 named. These volumes have been distributed by Congressman 

 Lilley, the plan having originated with R. W. Thompson, private 

 secretary to Senator Hawley. Bulletin No. 117 is bound in with 

 the volume. 



Folios. — No. 154. Winslow Folio, Arkansas — Indian Territory. 

 Description of the Winslow Quadrangle ; by A. H. Purdue. 

 Pp. 6, with 3 maps. 



