Geology and Mineralogy. 441 



The importance of the Bryozoa from the view of the strati- 

 graphical geologist, is again second to no other class of fossil 

 remains. Many of them have a wide geographical distribution, 

 and as they usually occur in greater or less abundance, and are 

 very persistent in their characters, their value as data upon which 

 to base correlations of strata of widely separated localities can- 

 not be overestimated. Many of them, especially of the suborder 

 Trepostomata, are serviceable even where other fossils are too 

 imperfect, since with the aid of thin sections, mere fractions can 

 often be identified with certainty." 



8. The Tertiary Mollusks of Florida. — The second part of 

 Mr. W. H. D all's " Contributions to the Tertiary Fauna of 

 Florida, with especial reference to the Miocene silex-beds of 

 Tampa and the Pliocene beds of the Caloosahatchie river," has 

 appeared in the transactions of the Wagner Free Institute of 

 Science. (Vol. 3, Part II, December, 1892, pp. 201-473, with 

 Plates 13-22).* — This part discusses the streptodont and other 

 Gastropods. One hundred and eighteen new species are described 

 belonging to fifty-one distinct genera. In addition to the purely 

 descriptive portions of the work, in several cases the author has 

 given a comprehensive review of all the species of the generic 

 group discussed, and has commented upon the relations of the 

 species to each other and their natural associations into subgen- 

 eric and generic groups. h. s. w. 



9. Petroqraphische Untersuchungen an argentinischen Gran- 

 iten. J. Romberg, Berlin. (N. J. M. B. B. VIII).— The ma- 

 terial upon which this investigation has been carried out was 

 collected by Prof. Brackebusch during his geological explora- 

 tions in Argentina. Besides the descriptions of rocks the work 

 contains a full discussion of many points of petrographical interest 

 relating to dynamic processes. The rocks are grouped and the 

 •components treated separately with regard to special details. 

 A description of a new mineral with an analysis on rather impure 

 material by Jannasch is given. It seems to be between andalusite 

 and dumortierite and is marked by a blood-red pleochroism. No 

 name is proposed. l. v. p. 



10. Phonolite in Great Britain. — In a brief description of 

 some lower Carboniferons volcanic rocks of East Lowthian 

 Dr. Hatch mentions a new occurrence of phonolite, the second 

 recorded for the British Isles, composing a hill called Traprain 

 Law. There are also some basalts and trachytes described and a 

 limburgite which would seem to be rather a nephelite-basalt. — 

 Trans. Roy. Hoc. Edin., vol. xxxvii, pt. I, No. 8. l. v. p. 



11. Catalogue of American Localities of Minerals • by Ed- 

 ward S. Dana. 51 pp. large 8vo. New York, 1893 (John Wiley 

 ■& Sons). — Pages 1053 to 1104 of Dana's System of Mineralogy 

 have been reprinted and issued separately for the convenience of 

 those desiring the Catalogue of Mineral Localities in a small 

 volume by itself. 



* See this Journal, p. 351, April, 1893. 



