CALCAREOUS ALGAE OF THE MIDDLE EAST 



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Fig. i. Sketch-map of the Middle East, showing areas of provenance of principal 



collections examined. 



nician at Iraq Petroleum's London headquarters, several times provided me with 

 good transverse and longitudinal sections of dasyclads no larger than a few 

 millimetres of fine pencil-lead, and Mr. J. Pope, of the Company's Photographic 

 Department coped admirably with the problems of microphotography of largely 

 monochromatic thin-sections : I thank them both. The distribution-maps and 

 range-charts were prepared in Iraq Petroleum's Prodex Drawing-Office, and my 

 thanks are due to Mr. E. G. Field and his staff for their services. 



At Reading University, where these studies were continued and the present work 

 offered as a thesis for the degree of Ph.D., I am especially grateful to my supervisors, 

 Professor P. Allen, Dept. of Geology, and Professor T. Harris, Dept. of Botany, for 



