72 /Scientific Intelligence. 



groups of genera. The last of the general introductory matter is 

 on the embryology and especially the early and post-embryonic 

 stages in the development of the shell. 



These observations are followed by succinct descriptions of the 

 genera, with mention of their geological range and the type 

 species. The genera are well illustrated in the twenty-two litho- 

 graphic plates accompanying this work which were drawn in the 

 most perfect manner by Philip Ast, the well-known artist of the 

 Palaeontology of New York. 



The present volume includes the inarticulates with the orthoid, 

 strophomenoid, and productoid genera of the articulates. The 

 authors propose to complete the work with plates and descriptions 

 of the spire- and loop-bearing forms, together with a general 

 chapter on the classification of the Brachiopoda. c. e. b. 



3. Bibliotheque Geologique de la Mussie, vol. viii, 1892, par S. 

 Nikitin, pp. 1-215, St. Petersbourg and Paris, 1893. 



The eighth volume of this valuable digest of Russian geological 

 literature contains titles and brief synopses of contents, in both 

 Russian and French, of the literature of 1892. Its value is in- 

 creased by the addition of full indices, arranged according to 

 subjects, geographic, biologic and authors' names. 



4. Illustrations of the Fauna of the St. John Group, No. viii; 

 by G. F. Matthew. (Trans. Roy. Soc. Canada, Section iv, 

 1893.) pp. 85-129, Plates xvi, xvii, 1894. 



In the closing number of this important monograph, which has 

 been issued serially, is added a " list of the Fossils of the Cam- 

 brian and Ordovician rocks in and near St. John, being those of 

 the Basal or Etcheminian series and of the St. John Group," in 

 which are listed 220 species and varieties. 



The following thicknesses are given of the rocks of the St. John 

 Basin, viz: 



Basal series (Etcheminian) at Hanford Brook, St. Martin's, 1,200 ft. 



Division 1 (Acadian) at the Alms House, Simonds, 650 " 



Division 2 (Johannian) at King's Square, Carleton, 1,000 " 



Division 3 (Bretonian) at Straight Shore, Portland, TOO " 



3,550 ft. 



At the close of the paper the author remarks on the use of the 

 name St. John group as follows : 



" Since the range of the terrain is now know T n, the name St. 

 John group cannot be used as synonymous with Cambrian ; nor 

 is it of value as that of a group with a specialized fauna of local 

 import only. It is rather to be regarded as presenting a phase 

 of the Cambrian and Ordovician faunas of regional value, and 

 especially as showing a succession of American faunas of those 

 times, having close relations with the co-temporaneous faunas of 

 Europe. Its claim to general use has been abrogated by the dis- 

 covery of its faunas, and it now stands on much the same footing 

 as the Quebec group of Sir Win. Logan. These names must 

 give place to the older ones, Cambrian and Lower Silurian 



