Reviews — Seeley^s Ornithosauria. 341 



basins of India were on the large scale marked out, and existed (as 

 drainage basins) at the enormously distant period which marked the 

 commencement of the deposition of this great plant-bearing series. 

 In this point of view, local variations in the lithological type, and 

 local variations in the thickness of the groups, and even their occur- 

 rence, or non-occurrence, are only necessary consequences of the 

 mode and limits of formation. 



The work carried on in Madras, Bombay, and Burmah, is briefly 

 alluded to. 



In regard to the Museum, it may be mentioned that during the 

 year more than 20,000 specimens have passed through the hands of 

 the Curator and his Assistant, and have been catalogued for reference ; 

 but many of these had to be packed up again, there being no place 

 to keep them otherwise. 



An Index-map is appended to this Eeport, showing roughly the 

 present state of progress of the Geological Survey of India. 



laiE'viE^ws. 



The Oenithosauria : an Elementary Study of the Bones of Ptero- 

 dactyles, made from Fossil Eemains found in the Cambridge 

 Upper Greensand, and arranged in the Woodwardian Museum 

 of the University of Cambridge. By H. G. Seeley. Cambridge : 

 Deighton, Bell, & Co., 1870. 



THIS volume is the second of a series of " Indexes and Memoirs " 

 descriptive of the PalEeontological remains in the "Woodwardian 

 Museum, in course of preparation by Mr. Seeley, and has followed 

 closely upon his less pretentious, but useful, " Index " to the same 

 collection published last year.' Although professing to be only an 

 " elementary study of the bones of Pterodactyles," from a very 

 limited geographical area, and as limited a geological era, yet the 

 author has gathered and put together in a condensed form a large 

 amount of information on the subject of which he treats, derived 

 from many sources and from his own observations. 



The work may be divided into four parts : 1st, the Introduction ; 

 2nd, the Osteological details, in which the general character of each 

 bone of this group of animals is fully described, without regard to 

 genus or species ; 3rd, their Classification ; and, 4th, a Synopsis of 

 the Species in the Woodwardian Museum. 



The author enumerates, in the Introduction to his work, the 

 material which he has had at his disposal ; it comprised a series of 

 more than 500 bones in one collection, and about 400 in another, 

 and he computes that they could not have " pertained to fewer than 

 150 individuals — a remarkable quantity from so small an area, and a 

 striking proof of the numbers in which this Order of Vertebrates 

 abounded when this deposit was being formed. All the bones from 

 the Cambridge Greensand are more or less broken, but their arti- 



1 See Geol. Mag., Vol. VII., p. 34. 



