Geology and Mineralogy. 459 



the chief representatives of the Theropoda, The order Sauropoda 

 is confined to the Jurassic, and contains some most striking forms. 

 Among them, Atlantosaicrus, Brontosaurus, Apatosaurus, Diplo- 

 docus, and Morosaurus are remarkable for their huge size. The 

 Predentata of the Jurassic include the well-known Stegosaitrus, 

 and the bird-footed genera Camptosaurus^ Laosanrus, and the 

 smallest of known Dinosaurs, Nanosaurus. 



Dinosaurs were still abundant in the Cretaceous, and in general 

 were more highly specialized than in the preceding formations. 

 Ornithomimus, with its bird-like feet and the coossified pelvic 

 arch, is one of the most important carnivores. The main interest 

 in the Cretaceous Dinosaurs centers about the most remarkable 

 group of gigantic, horned Predentata, known as the Ceratopsidm, 

 including Triceratops, Ceratops, Torosaurus, Sterrholophus, 

 Agathauinas, Polyonax, and Monoclonms. The remaining her- 

 bivorous forms include the ClaosauridcB, Trachodontidm (^Hadro- 

 sauridce), and Nodosaaridm. 



The more important bones of the skeleton of each type are 

 fully illustrated, and the best-known forms are represented by 

 complete restorations: such as Anchisaurus of the Triassic; 

 Ceratosaurus, Prontosaurus, Stegosaurus, Gamptosaurus, and 

 Xaosofwrw^, of -the Jurassic; and Triceratops and Claosaurus of 

 the Cretaceous. 



Restorations of four leading: types of European Dinosaurs are 

 introduced for comparison: Compsognathus, a, small carnivore; 

 Scelidosaurus, a herbivorous form related to Stegosaurus; Hysiloph- 

 odon^ related to Laosaurus / and Iguanodon. 



A separate chapter is devoted to the affinities of the Dinosaurs, 

 and homologies are established with the Aetosauria, the Pelo- 

 dontia, the Grocodilla, and with Birds. In the concluding 

 chapter, a classification of the entire group is presented. 



c. E. B. 



5. ManuaV of Peter miiiative Mineralogy with an iyitroduction 

 on Plow-pipe Analysis ; by Geo. J. Brush, revised and enlarged 

 by Samuel L. Penfield, 8vo, 163 pp., 33 tables. New York, 

 (Wiley <fc Sons), 1896. — That this well know work has been 

 appreciated by the public is shown by the fact that the present is 

 the fourteenth edition since its appearance in 1874. The present 

 edition by Prof. Penfield is not, however, a merely formal one ; 

 on the contrary, the book, while retaining all the features which 

 have characterized and given it its value, has been for the most 

 part rewritten, and considerably enlarged. Especially valuable 

 to teachers and self-students will be found the chapter on the 

 reactions of the elements; many new methods of testing are here 

 added. The distinguishing feature of the work is its eminently 

 practical character; in all cases the most simple, useful and 

 decisive methods are given; there is no padding with descriptions 

 of complicated methods or those which have only a theoretic 

 interest. The suggestions given under the experiments will be of 

 great value. The work throughout shows that it comes at first 



