CHELONIA 213 



The period, especially the first half of it, was one of great activity on 

 the part of students of the extinct species of this interesting group. 

 More than twenty-five authors produced each one or more papers on the 

 subject. In these treatises many new species were described, our knowl- 

 edge of the structure of many previously named forms increased, and 

 the relationships of the members of the group to one another and to 

 the other orders of reptiles rendered clearer. These communications, 

 furthermore, compel a recognition of the vast amount of discovery and 

 of investigation 3Tt required to place the subject in a satisfactory state. 



It has been thought better to discuss the work of the decade chrono- 

 logically than under the names of authors. 



1902 



Bloch (1) described and figured an unusually well preserved specimen 

 of Tropidemys Jangii that had been found in the Jurassic quarries near 

 Solothurn. Hay (2) announced a new species Testudo atascosce from 

 the Pleistocene of Texas; also described a nearly complete shell of 

 Terrapene eurypygia (Cope). Gaudry (38) expressed his opinion re- 

 garding the alveoles in the jaw of the supposed dentated trionychid 

 described by De Stefano. Howes (3), in his address before the section 

 of zoology of the British Association, declared that paleontology had 

 definitely clinched the supposed relationship of the Chelonia to the 

 Plesiosauria. He based his opinion especially on the structure of the 

 shoulder girdle of Cryptocleidus. Jaekel described (4) the remarkable 

 reptile Placochelys placodonta and expressed the opinion that it threw 

 important light on the phvlogeny of the turtles. Lambe (9) reported 

 the occurrence of Trionyx for eat us and T. ragans in the Cretaceous of 

 Alberta. Foger (49, XXXA") studied the turtles of the Upper Miocene 

 of the tableland of Bavaria and Swabia, listing the species,, of which 2 

 are new. Portis (38) contested De Stefano's interpretation of the alve- 

 oles in the supposed dentated trionychid. De Stefano (5) published 

 a paper of 33 pages, with 12 figures, on Emys cuvieri. He also de- 

 scribed (6) as belonging to a new genus and species a trionychid called 

 Castresia rnunieri from the Eocene^ of France. In another paper (7) 

 he proposed the new species Eudastes douvillei. He announced (8) 

 what he regarded as a new type of trionychid turtle as indicated by a jaw 

 presenting alveoli for teeth. He also (8) described as new StyJemys 

 bottii, from probably the Miocene of France. He (5) named and de- 

 scribed four new species of Cenozoic turtles. For abstracts of De Ste- 

 fano's papers the reader may see Geologisches Centralblatt, volume V. 

 Wieland (10) published notes on Toxochelys and Archelon, and pro- 



