PROCEEDINGS 



OF THE 



WASHINGTON ACADEMY OF SCIENCES 



VOL. v, PP. 39-98. FEBRUARY 26, 1903, 



PAPERS FROM THE HOPKINS STANFORD GALA- 

 PAGOS EXPEDITION, 1898-1899. 



XIV. 



REPTILES. 

 BY EDMUND HELLER. 



CONTENTS. 



Introduction 39 



Itinerary 39 



Material . 42 



Geologic formation 42 



Subsidence theory 42 



Age of Galapagos archipelago. 44 



Previous expeditions 44 



Reptilian derivation 44 



Distribution . . 46 



Systematic account 48 



INTRODUCTION. 



Itinerary. In the fall of 1898 the department of zoology 

 of Stanford University, under the patronage of Mr. Timothy 

 Hopkins, of Menlo Park, California, sent to the Galapagos 

 Islands a party composed of two collectors, Mr. Robt. E. Snod- 

 grass and the author, on the sealing schooner Julia E. Whalen 

 which was bound on a cruise among those islands. The party 

 was primarily interested in collecting vertebrates, but collections 

 more or less complete were also made in nearly every class of 

 animals and plants. The party had special privileges for col- 

 lecting and was given an opportunity to collect on every island 

 of the group. 



Proc. Wash. Acad. Sci., February, 1903. 39 



