PLATES 



PlATE I 12S 



Fig. 1. Leptinotarsa undecimlineata, normal form. 



Fig. 3. Form derived from L. undecimlineata through 

 the application of the climatic conditions. 



Figs. 3, 4. Normal mitosis of nuclei in ceUs of plant. 



Figs. 5, 6, 7, 8. Irregularities of mitosis in cells of 

 onion roots resulting from exposure to radium. 

 [After Gager.] 



Plate II 133 



T. T. Upper and lower aspects of rosette of (Enothera 



D. D. Rosette of derivative resulting from ovarial 

 treatment with zinc sulphate. 



Plate III. A Few op the NtrMEBotrs Ttpes of Teeth in 



THE Chaeaciits 193 



Plate IV. Some Similarities in the Chabacins . . 193 



Plate V 345 



RECTIGBADATIOSrS IN THE TeETH OF EoCENE UNGULATES. 



Top View of Thbee Skulls of Eocene Titanothebes 

 iLLirsTRATiNa Bbachtcephalt, Mesaticefhalt, and 

 Dolichocephaly Bespectivelt. 



