Reviews — Guide to Geology and Palaeontology. 429 



since it is very difficult to make its divisions accord in importance 

 with those of the other vertebrate classes ; we think, however, 

 that it will be advisable eventually to rank the divisions of 

 Carinatas, Ratitas, and Saururas as orders, and to relegate to the 

 rank of suborders the so-called orders into which the Carinataa are 

 divided by students who confine their attention to existing forms. 



Pages 70 to 87 are assigned to the Reptilia. and we note with 

 satisfaction the classification which has been adopted in this difficult 

 class, as being one of the best that has come under our observation. 

 The orders adopted are the Pterosauria, Crocodilia, Dinosauria, 

 Anomodontia, Ichthyosauria, Ophidia, Lacertilia, Plesiosauria, and 

 Chelonia. The divisions of the second order proposed by Prof. 

 Marsh are adopted with a subordinal value ; while the Anomodontia 

 includes the Theriodontia, Dicynodontia, Ehynchocephalia, Crypto- 

 dontia, Endothiodontia, and Placodontia. According to this arrange- 

 ment it will be necessary to retain Prof. Dollo's group of the Simae- 

 dosauria for Champsosaurus, since that genus seems more distinct 

 than Endothiodon from the typical Ehynchocephalia ; we should, how- 

 ever, have preferred to have placed the last-named genus in closer 

 proximity to that suborder. In the Lacertilia the Mosasauridcs are 

 ranked merely as a family, which avoids the necessity of the intro- 

 duction of Prof. Cope's Pythonomorpha. In this class there are 

 figures of Bhamphorhynchus, Pterodactylus, Dimorphodon, Iguanodon, 

 Megalosaurus, Ichthyosaurus, Plesiosaurus, Megalania, and Chelone. 



Skeleton of Iguanodon JBernissartensis, Boulanger (restored after Dollo) from the 

 specimen in the Brussels Museum. 



The Invertebrates occupy pp. 92-107, but as the notice of these 

 classes is necessarily brief, we need not refer further to them on this 

 occasion. The last page of the text mentions the extensive collection 



