Preface. IX 



comparison with those obtained previously by Leidy, 

 Cope, Marsh, and others. Of the same nature are the 

 exact researches by Mr. F. B. Loomis, on the Jurassic 

 stratigraphy of Wyoming (Nos. 37, 48.) 



PAL^ONTOLOGICAL RESULTS. 



Dinosaurs and other Reptiles. Bulletins. — 



The first paper, No. 27, is an erroneous identification 

 by Osborn of Camarasauriis Cope with Brontosmtrits 

 Marsh, it having since been found that Camarasauriis 

 is more nearly allied to Morosatiriis. In this paper 

 the vertebral structure of Sauropoda is discussed. The 

 fore and hind limbs of carnivorous and herbivorous 

 Dinosaurs are discussed by Osborn in later papers. 

 The latest contributions are an account of the skull of 

 Crcosaiirus by Osborn, No. 61, and of the skull of 

 Triccratops by Lull, No. 60. 



Attention should be called here to a series of import- 

 ant memoirs on fossil reptiles, namely : A complete 

 Mosasanr Skeleton, by Osborn ; A Skeleton of Diplo- 

 dociis, by Osborn ; On the Reptilian Subclasses Diap- 

 sida and Synapsida and the early history of the Diapto- 

 sauj'ia, by Osborn. 



Evolutionary Series. — One of the principal ob- 

 jects of our expeditions has been the completion of 

 the evolutionary or phyletic series so far as possible, 

 with a view to working out the development of differ- 

 ent orders and families from their first appearance to 

 their extinction. 



To this subject the following papers have been espe- 

 cially devoted : No. 7, Ancestors of the Tapir, by 

 Wortman and Earle ; No. 19, on the Ganodonta and 

 Edentata, by Wortman ; No. 24, on the Camelidcr, by 



