434 Canadian Record of Science. 



reached that the action Of land ice is not sufficient to 

 account for our so-called glacial phenomena. 



" Illustrations of the Fauna of the St. John Group. No. 

 V. On the Great Acadian Trilobite, Paradoxides Eegina," 

 by G. F. Matthew, contains a description of the largest- 

 known animal of the Cambrian age. About 1745-40 Lin- 

 naeus described the Paradoxides Tessini, and in 1759 a second 

 species. Two other large species are found in Northern 

 Europe. A Paradoxides was first found in America in 1834, 

 and others have since been discovered on this continent and 

 in Europe. Some of them are very large. They belong to 

 both the first and the second Fauna of Barrande. Para- 

 doxides Regina is described, and it is supposed to be the 

 largest known trilobite, one complete specimen measuring 

 fifteen inches in length by twelve in width, while fragments 

 of others indicate still greater proportions. It is closely 

 allied to two other species, but is probably distinct from 

 them. 



In " The Diurnal Motion of the Earth in Its Eelation to 

 Geological Phenomena," by W. A. Ashe, the author 

 points out the possible connection between the lines of fold- 

 ing or upheavel of the crust of the earth, and the effect of 

 the rotation of the planet on the rigid as compared with the 

 fluid portions, and of the necessity of the solid parts accom- 

 modating themselves to the ever-contracting fluid portion. 

 He shows that the area of present active volcanoes ought 

 to be limited by a zone of 45° on either side of the equator, 

 and that the greatest activity ought to be about latitudes 

 36° 20' N. and S. ; also that the highest mountains should 

 be found about these parallels. The probable flow of ocean 

 cuiTents at different geological periods is indicated. The 

 author maintains that the earth is made up of three distinct 

 elements in equilibrium ; first, the solid nucleus, in which 

 the polar diameter is to the equatorial, as 299 is to 300 ; 

 second, the waters, with a greater difference between their 

 diameters; and third, the atmosphere, with a still greater 

 difference. We would, therefore, have less water and much 

 less atmosphere at the poles than at the equator, but their 

 physical properties and other causes modify this appai-ently 



