PAI^EONTOLOGY — CASE). 23 1 



PALEONTOLOGY. 



Case, E. C, University of Michigan, Ann Arbor, Michigan. Grants Nos. 

 559 and 611. Continuation of work upon the vertebrate fauna of the 

 Permian period in North America. (For previous reports see Year 

 Books Nos. 2, 4, 8, and 9.) $3,200 



Two monographs, "A revision of the Cotylosauria of North America" and 

 "A revision of the Amphibia and Pisces of the Permian of North America," 

 Publications Nos. 145 and 146 of the Carnegie Institution of Washington, 

 have been completed and will appear before the end of the year 191 1. These 

 are the second and third monographs in the series dealing with the verte- 

 brate fauna of the red beds of North America, commonly regarded as of 

 Permian or Permo-Carboniferous age. The first of the series, a monograph 

 entitled "A revision of the Pelycosauria of North America," has already 

 been issued by the Carnegie Institution as Publication No. 55. The fourth 

 and concluding monograph of the series will deal with the conditions of 

 deposition of the Permian, the paleogeography of the period, and the factors 

 which governed the development and distribution of the fauna. 



Publication No. 145 has 122 pages, 52 figures, and 14 plates. It deals with 

 the most primitive group of reptiles found in the beds, describing the anat- 

 omy and relationships of the various forms and their general relationship to 

 the similar forms found in Europe and Africa. An important part of the 

 monograph is the collection of the original descriptions of types by earlier 

 authors, which have been printed in scattered papers and were difficult of 

 access. A revised description of the known forms and descriptions of new 

 forms follows the original descriptions. The pioneer work by older authors 

 left the taxonomy of the group in bad shape, and it is hoped that this has 

 been satisfactorily cleared up and a good basis for future work established. 



Publication No. 146, 184 pages, 56 figures, and ^2 plates, treats the Am- 

 phibia in the same manner as the Cotylosauria, collecting the original de- 

 scriptions, giving revised descriptions, correcting the taxonomy, and adding 

 much that is new. The work upon the fishes has been carried on in the 

 same way as that upon the Amphibia, but is the work of Dr. Louis Hussakof, 

 of the American Museum of Natural History in New York. A description 

 of two new fossil cockroaches from the Permian of Texas is the work of 

 Professor Sellards, of the University of Florida. 



The basis of the monographs is the material in the collections of the 

 American Museum of Natural History in New York, Yale University, the 

 University of Chicago, and the Alte Akademie of Munich. This includes all 

 of any importance which has come from the Permian of North America. 

 All material published up to the date of the completion of the manuscript has 

 been reviewed, and all known forms described and fully illustrated. 



