EXPERIMENTS IN THE BREEDING OF CERIONS. 



51 



fulgurate with various shades of brown. Specimens with the outUne 

 of typical Cerion incanum and Cerion viaregis may be strongly mottled 

 and splashed with brown. Sometimes a specimen having the outUne, 

 sculpture, and external coloration of Cerion incanum shows the interior 

 coloration of typical Cerion viaregis, and vice versa. 



Tables 32 and 33 give measurements of the check series of Cerion 

 incanum and of the cross between Cerion viaregis and Cerion incanum, 

 while table 34 gives a comparison of the summaries of Cerion viaregis, 

 Cerion incanum, and Cerion viaregis X Cerion incanum. 



Table 34 shows that the cross between Cerion incanum and Cerion 

 viaregis stands between the parent species, as far as number of whorls 

 and measurements of altitude and diameter are concerned. The speci- 

 mens figured on plates 57, 58, and 59, are now in my conservatory at 

 Washington, where an attempt is being made to simulate the Florida 

 environmental conditions, as far as it is possible to do so. We have 



