Geology and Natural History. 539 



doxides (M. torosus= Paradoxides torosus of Meneghini), Mene- 

 ghinella, and Giordanella (Illcenus Menghinioi Bornemann, 1883). 

 The beds afford also two new species of Archceocyathus and a 

 related species called Dictyocyathas tenerrimxis • also among 

 Gasteropods, a Capulus (?) a Carinaropsis (?) and a Bellerophon (?), 

 also a Confervites. 



5. Fossils in the St. Peter's Sandstone. — The sandstone in the 

 railroad cuts about five miles south of St. Paul, Minnesota, has 

 afforded Mr. F. W. Sandeson fossils of the species Murchisonia 

 gracilis, and probably M. tricarinata, a probable Maclurea, 

 Cypricardites rectirostris Hall, and two other species of the genus, 

 and a doubtful Modiolopsis. They resemble species found in the 

 lower part of the Trenton shales and in the Trenton limestone 

 overlying the St. Peter's sandstone. — Bidl. Minn. Acad. Nat. Sci., 

 iii, 318. 



6. Correlation Papers : The Eocene of the United States, by 

 Wm. B. Clark, Bull. 83, U. S. Geol. Survey. This makes the 



fourth of the valuable series of Correlation papers published by 

 the II. S. Geological Survey. 



7. Glacier Rock-crushing. — Mr. W. G. Tight has described, 

 and illustrated by fine phototypes various examples of the crush- 

 ing of the surface rocks near Newark, in Licking Co., Ohio, in 

 the Bulletin of the Scientific Laboratories of Denison University, 

 vol. vi, p. 12. 



8. The System of Mineralogy of James D. Dana, ] 83*7-1 868 : 

 Descriptive Mineralogy. Sixth edition by Edward S. Dana. — 

 Entirely rewritten and much enlarged, illustrated with over 1400 

 figures, pp. i-lxii, 1134, large 8vo. New York, 1892, (John Wiley 

 and Sons.) — Twenty-four years have passed since the fifth edition 

 of this work was published, and the rapid progress of the science 

 during that time, as also the development of the plan of the work, 

 have made the rewriting of neai-ly the whole necessary, with an 

 addition of about one-half to the size. In general, the excellent 

 and well tried plan of the former edition has been retained, es- 

 pecially as regards the historical lists of synonyms, the system of 

 classification, and the concise and compact arrangement and style 

 of description. Changes, however, of more or less importance are 

 made at many points, and in certain directions the work has been 

 done over again from the foundation. 



Some details in regard to the work are here condensed from the 

 Preface. On the crystallographic side it has been the attempt to 

 trace back to the original observer the fundamental angles for each 

 species, then the axes have been recalculated from them, and finally 

 the important angles for all common forms have been calculated 

 (anew, in every case), from these axes. The lists of forms have been 

 made up as completely as possible from the original authorities, 

 with the symbols on both the systems of Miller and Naumann, 

 though the preference is given to the former. References to the au- 

 thors are given freely; and these, with the others relating to the his- 

 tory of the names, and further those in connection with the lists of 



