﻿Description of Plate V, 



Fig. I. Impressions of recent rain drops on mud, . . . . . 127 



Fig. 2. Fossil impressions of rain drops, Clinton Co., Ohio. U. P. James' col- 

 lection, . . . . . . . . . . . .128 



Fig. 3. Recent mud bubbles, ......... 128 



Fig. 4. Fossil mud bubble (Discophycus typicalis, Walcott), . . .128 



Fig. 5. Fossil mud bubble ( CyUhophycus subsphericus, Walcott), . ' . 128 



Fig. 6. Recent mud mark, . . . . . . . . . .129 



Fig. 7. Recent mud mark, ......... 129 



Fig. 8. Fossil mud mark — after Hall, . . . . . . . .129 



Fig. 9. Fossil mud mark — Col. of Cin. Soc. Nat. Hist., . . . . 129 



