U. S. B. F.— Doc. 



PLATE XVI. 



FIG. 1. — EGG MASS OF BULLFROG; A SURFACE FILM 18 INCHES IN 



DIAMETER LAID AMONG DEAD STICKS AND OLD BOARDS. 



(After Wright. Carnegie Publ. No. 197.) 



FIG. 2.— A 



SURFACE PACKET OF TREE-TOAD EGGS ATTACHED TO A 

 POND-WEED LEAF. 



(After Wright, Carnegie Publ. No. 197.) 



