TRANSACTIONS OF THE 



CONNECTICUT ACADEMY OF ARTS AND SCIENCES 



Incorporated A. D. 1799 



VOLUME 18, PAGES 1-137 JUNE, 1913 



A Monograph of the Terres- 

 trial Palaeozoic Arachnida 

 of North America 



BY 



ALEXANDER PETRUNKEVITCH, Ph.D. 



ASSISTANT PROFESSOR OF ZOOLOGY AT YALE UNIVERSITY 



YALE UNIVERSITY PRESS 



NEW HAVEN, CONNECTICUT 

 1913 - 



