44 



EXPERIMENTS IN THE BREEDING OF CERIONS. 



DISCUSSION OF THE DATA. 

 First Generation of Florida-grown Cerion casablanc^. 



An examination of the first generation of Cerion casahlancoe 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 Floridorgrown Cerion casablancce. 



Colony, 



No. of 

 whorls. 



Altitude. 



Greater 

 diameter. 



No. of 

 specimens. 



Averages: 



First Key north of Sands Key 



Indian Key 



Bahia Honda Key, 1914 



Bahia Honda Key, 1915 



Loggerhead Kej', Colony A 



Loggerhead Key, Colony B, 1915 



Loggerhead Key, Colony B, 1916 



Loggerhead Key, Colony C 



Average of all Florida-grown first 



generation 



Average of check series 



Greatest: 



First Key north of Sands Key 



Indian Key 



Bahia Honda Key, 1914 



Bahia Honda Key, 1915 



Loggerhead Key, Colony A 



Loggerhead Key, Colony B, 1915 



Loggerhead Key, Colony B, 1916 



Loggerhead Key, Colony C 



Greatest of all Florida-grown first 



generation 



Greatest of check series 



Least: 



First Key north of Sands Key 



Indian Key 



Bahia Honda Key, 1914 



Bahia Honda Key, 1915 



Loggerhead Key, Colony A 



Loggerhead Key, Colony B, 1915 



Loggerhead Key, Colony B, 1916 



Loggerhead Key, Colony C , 



Least of all Florida-grown first gener- 

 ation 



Least of check series 



10.45 

 10.50 

 10.67 

 10.76 

 11.17 

 10.87 

 10.96 

 10.90 



10.79 

 10.92 



11.10 

 11.30 

 11.00 

 11.40 

 12.00 

 12.00 

 12.40 

 11.80 



12.40 

 12.10 



10.00 

 9.80 



10.30 

 9.40 



10.40 

 9.50 



10.10 



10.10 



9.40 

 10.00 



mm. 



28.31 



27.45 



29.71 



28.40 



28.80 



28.11 



28.70 



28.26 



28.47 

 27.19 



32.00 

 31.00 

 32.80 

 32.70 

 34.00 

 32.00 

 34.40 

 31.90 



34.40 

 32.90 



24.00 

 24.00 

 24.50 

 25.10 

 25.00 

 22.30 

 23.20 

 24.30 



22.30 

 24.00 



mm. 



14.10 



12.72 



13.30 



12.96 



12.28 



11.82 



12.59 



11.83 



12.70 

 13.70 



15.00 

 13.80 

 14.40 

 14.20 

 14.50 

 13.00 

 14.00 

 13.10 



15.00 

 15.60 



12.50 

 11.80 

 12.10 

 11.90 

 11.00 

 10.20 

 11.50 

 10.00 



23 

 18 

 10 

 56 

 19 

 122 

 73 

 36 



4463 



10.00 

 11.00 



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. 



