THE AMERICAN NATURALIST [Vol. XLV 



for the presentation of the memoir. The paper was puMMi'd in 

 successive issues of the Anualcs dc Pakontologie and in complete 

 form contains sixty-three quarto pages and nine photogravure 

 plates, illustrating all that is known of the Paleozoic amphibian 

 fauna of France up to the present. 



The author divides the amphibian forms into four groups : the 



phalrs-': the Trmnosp.mdyl.'s: the Aistopodes, and the Micro- 

 saurians, which unfortunately he ranks in with the reptiles, and 

 describes under this heading a form which a few years ago he had 

 concluded was a rhynchoeephnlian. Dr. Williston was more 



certain it is not a Microsaurian. 



Dr. Thevenin discusses, under the heading, Phyllospondyles. 

 the forms Protriton fayoli Thevenin, /'. prtroJci Gaudry, and 

 Pelosaurus laticeps Credner. The second group consists of 

 Actinodon brevis. A. frossardi and Euchirosaurus rochei. The 

 Aistopodes are represented by a single new form which is 

 unnamed. The specimen strikingly suggests the snake-like 

 amphibians of Ohio and Ireland. There are no true representa- 

 tives of the Mierosauria known in France. 



Nothing new is added to our previous knowledge of the com- 

 plex relations of the elements of the temnospondylous vertebra, 

 which is one of the most vexed and most discussed questions in 

 connection with the extinct amphibia. His homologies of the 



