34 Revieics — Prof. Hull on Building Stones, etc, 



indicate an animal about as large as a lion. The genus they repre- 

 sent may be called Oreocyon, and the type species, Oreocyon latidens. 

 3. Notice of a New Eeptile fkom the Cretaceous. By 0. 0. 

 Marsh. — An interesting addition to the Eeptilian fauna of the 

 Cretaceous shale of Kansas is a very small Saurian, which differs 

 widely from any hitherto discovered. The only remains at present 

 known are two lower jaws, nearly perfect, and with many of the 

 teeth in good preservation. The jaws resemble in general form 

 those of the Mosasauroid reptiles, but, aside from their very diminu- 

 tive size, present several features which no species of that group 

 has been observed to possess. The teeth are implanted in distinct 

 sockets and are directed obliquely backward. There were apparently 

 twenty teeth in each jaw, all compressed, and with very acute sum- 

 mits. The rami were united in front only by cartilage. There is 

 no distinct groove on their inner surface, as in all known Mosa- 

 sauroids. The dentigerous portion of the jaw is 41 mm. in length, 

 its depth below the last tooth is 5 mm. and below the first tooth in 

 front 3 mm. The specimen clearly indicates a new genus, which 

 may be called Colonosaurus, and the species may be named Colono- 

 saurus Mudgei, for the discoverer, Professor B. F. Mudge, who found 

 the remains in the Upper Cretaceous shale of Western Kansas. 



iaE3^v-iE"Vsrs 



I, — A Treatise on the Building and Ornamental Stones of 

 Great Britain and Foreign Countries. By Edward Hull, 

 M.A., F.E.S. (London : Macmillan & Co., 1872.) 



SINCE the valuable Eeport in 1839 of the Commissioners appointed 

 to inquire into the qualities of the stone to be used in building 

 the New Houses of Parliament, no special treatise has appeared on 

 the subject. Even that very useful Eeport is to some extent 

 limited in its scope, as it was not considered necessary to extend the 

 inquiry to granites, porphyries, and other stones of similar character, 

 on account of the enormous expense of converting them to building 

 purposes in decorated edifices, and from a conviction that an equally 

 durable and more eligible material could be obtained from among 

 the limestones and sandstones of the kingdom. Hitherto the chief 

 information in this country on building stones has had to be sought for 

 in the works on architecture, engineering, and masonry, or scattered 

 through the journals of societies, or geological manuals, and there- 

 fore not systematically or scientifically treated in any separate work. 

 Two important works in French on the subject must, however, be 

 noticed, the " Technologic du Batiment," by M. T. Chateau ; and 

 " Materiaux de Construction," by M. Delesse. With the view of 

 supplying this deficiency in our own language. Prof. Hull has 

 brought together a vast mass of practically useful and interesting 

 information on the building and ornamental stones, both of our own 

 and foreign countries; the different materials being arranged ac- 



