206 



Prof. 0. C. Marsh — The Wings of Pterodactyles. 



modern bats. As the wings were partially folded at the time of 

 entombment, the volant membranes were naturally contracted into 

 folds, and the surface was also marked by delicate striae. At first 

 sight, these strise might readily be mistaken for a thin coating of 

 hair, but on closer investigation they are seen to be minute wrinkles 

 in the surface of the membranes, the under side of which is exposed. 

 The wing membranes appear to have been attached in front along 

 the entire length of the arm, and out to the end of the elongated 

 wing finger. From this point the outer margin curved inward and 

 backward, to the hind foot. 





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