30 



EXPERIMENTS IN THE BREEDING OF CERIONS. 



DISCUSSION OF DATA. 



First Generation of Florida-grown Cerion viaregis. 



In reviewing the pictures of all the first-generation specimens of 

 Florida-grown Cerion viaregis and comparing them with the check 

 series of specimens found on Andros Island, Bahamas, one is led to the 

 conclusion that, as far as general shape and sculpture are concerned, 

 httle or no new variations have appeared in the Florida-grown speci- 

 mens. Whatever variation occurs in the Florida specimens is also to 

 be found in the check series from Andros Island. An analysis of the 

 measurements of the first generation of all the Florida-grown specimens 

 gives the results shown in table 13. 



Table No. 13. — First generation Floridogrown Cerion viaregis. 



Colony. 



No. of 

 whorls. 



Altitude. 



Greater 

 diameter. 



No. of 

 specimens. 



Averages: 



Second Key north of Sands Key 



Boca Grande Key 



Loggerhead Key, Colony E 



Loggerhead Key, Colony F, 1917 



Loggerhead Key, Colony F, 1919 



Loggerhead Key, Colony G, 1915 



Loggerhead Key, Colony G, 1916 



Loggerhead Key, Colony M 



Average of all Florida-grown first 



generation 



Average of check series 



Greatest: 



Second Key north of Sanda Key 



Boca Grande Key 



Loggerhead Key, Colony E 



Loggerhead Key, Colony F, 1917 



Loggerhead Key, Colony F, 1919 



Loggerhead Key, Colony G, 1915 



Loggerhead Key, Colony G, 1916 



Loggerhead Key, Colony M 



Greatest of all Florida-grown first 



generation 



Greatest of check series 



Least: 



Second Key north of Sands Key 



Boca Grande Key 



Loggerhead Key, Colony E 



Loggerhead Key, Colony F, 1917 



Loggerhead Key, Colony F, 1919 



Loggerhead Key, Colony G, 1915 



Loggerhead Key, Colony G, 1916 



Loggerhead Key, Colony M 



Least of aU Floridar-grown first 



generation 



Least of check series 



10.03 

 10.31 

 10.05 

 10.15 

 10.20 

 10.21 

 10.20 

 10.14 



mm. 



22.82 



23.57 



22.47 



22.53 



22.59 



22.73 



23.39 



22.63 



mm.. 



10.40 



10.46 



10.02 



11.68 



10.60 



10.37 



10.70 



11.71 



76 



107 



250 



30 



100 



49 



78 



26 



10.16 

 10.08 



22.84 

 22.56 



10.74 

 11.13 



716 



11.0 

 11.2 

 12.0 

 10.6 

 11.5 

 11.2 

 11.2 

 10.9 



25.8 

 27.1 

 27.9 

 24.2 

 27.7 

 26.0 

 27.0 

 24.5 



11.4 

 11.6 

 11.4 

 12.5 

 12.0 

 11.7 

 11.9 

 13.0 



12.0 

 11.0 



27.9 

 27.0 



13.0 



12.7 



9.5 

 8.9 

 9.4 

 9.5 

 9.2 

 9.3 

 9.4 



19. 



20. 



18. 



20. 



19. 



20. 



20.9 



20.0 



9.5 



9.0 



8.8 



10.5 



9.4 



9.5 



10.0 



10.9 



8.9 

 9.1 



18.7 

 19.0 



8.8 

 9.0 



