44 



EXPERIMENTS IN THE BREEDING OF CERIONS. 



DISCUSSION OF THE DATA. 

 FIRST GENERATION OF FLORIDA-GROWN CERION CAS ABL ANCLE. 



An examination of the first generation of Cerion casablancce grown 

 on the various Florida keys reveals the fact that, so as far as type of 

 structure is concerned, no deviation appears to have taken place 

 beyond that found in material from the White House region of Andros. 

 An analysis of the measurements of the first generation gives the results 

 shown in table 27. 



TABLE No. 27. First generation Florida-grown Cerion casablancce. 



This analysis shows that we have a little larger range of variation in 

 the first Florida-grown generation than in the check series from Andros 

 Island, Bahamas. In the number of whorls the Florida-grown speci- 

 mens vary from 12.4 to 9.4, while the check series varies from 12.1 to 10. 



