U. S. B. F.— Doc. 



Plate XI, 



FIG. 1.— GREEN FROGS. EARDRUM NORMAL IN FEMALE, EN- 

 LARGED IN MALE. 

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



FIG. 2.— LEOPARD FROGS. PECTORAL EMBRACE. 

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



FIG. 3.— TREE TOADS. AXILLARY EMBRACE. 

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



FIG. 4.— COUCH'S SPADEFOOTS. 

 INGUINAL EMBRACE. 



