REVIEWS 20 7 



sponges, with five species, are recorded, with thirteen genera and 

 twenty-one species of coelenterata. 



6. New Species of Brachiopoda described in the Paleontology of New 

 York, Vol. VIII, Parts I and II, 187 2-1 892. By James Hall, pp. 

 323-402, Pis. I-XIV. 



In this paper are published the descriptions of 106 species of 

 brachiopoda, which were described incidentally and sometimes figured 

 without descriptions in the recent work upon the class by Hall and 

 Clarke. 



7. A Handbook of the Genera of North American Palceozoic Bryozoa. 

 With an Introduction upon the Structure of Living Species. By G. B. 

 Simpson, pp. 403-699. Pis. A-E, I-XXV, and 222 figures in the text. 



The first portion of this work is devoted to the recent bryozoa, and 

 contains the history of observations upon these organisms from 159910 

 the present time, followed by a bibliography and an illustrated detailed 

 account of the anatomy. 



The second part is devoted to the fossil forms from the Palaeozoic 

 rocks, and contains a scheme of classification, the bibliography of the 

 Palaeozoic species of America, a list of the genera and species described, 

 with references to authorship and the geologic formations in which they 

 occur. The genera described number 156, the species enumerated are 

 about 1 100. The main portion of the second part is devoted to diag- 

 noses of the genera, illustrated by 222 figures in the text and by 25 

 plates. Stuart Weller. 



Petrology for Students, An hitroduction to the Study of Rocks under 

 the Microscope. By Alfred Harker, M.A., F.G.S. Second 

 Edition, Revised. Cambridge, England, 1897. 



A review of the first edition of this book by the present writer 

 appeared in this Journal, Vol. Ill, 1895, P- 856. The present edition 

 reproduces the original text, with slight alterations, some of which 

 follow the changes that appeared in the third edition of the second 

 volume of Rosenbusch's Mikroskopische Physiographic, etc., pub- 

 lished in 1896; besides the addition of numerous notices of American 

 and Norwegian occurrences of various rocks, with references to their 

 descriptions. The fuller mention of American occurrences increases 



