FOREWORD 



Dr. Frank E. Peabody died on June 27, 1958, leaving several manu- 

 scripts in various stages of completion. The one published here, based 

 on a specimen in the collections of the United States National Mu- 

 seum, was complete except for final touching up of some of the il- 

 lustrations ; these illustrations have been finished by Miss Madeline M. 

 Peabody with the help of Dr. Theodore H. Eaton, Jr. The manuscript 

 has been edited by Dr. Eaton and myself. Dr. Peabody 's paper presents 

 a welcome clarification of the relationships of an important, and here- 

 tofore much misunderstood, early reptile. 



Peter P. Vaughn 



