48 



EXPERIMENTS IN THE BREEDING OF CERIONS. 



Cerion uva (Linn^us) 

 The Loggerhead Key Colony N. 



On May 25, 1916, we planted 8,317 of this species which had been 

 gathered by Dr. Ralph Arnold on Curagao, Netherlands West Indies, 

 in the southeastern end of the large central meadow in the southern end 

 of the island. We first cleared the meadow of the abundant cactus 

 growth. The ground here is largely fringed with bay cedars and cov- 

 ered with a good growth of Sporoholus virginicus and Cyprus hrunneus. 



From the above-mentioned collection 100 specimens, taken at ran- 

 dom. Cat. No. 334725, U. S. N. M., yield the measurements given in 

 table 31. These specimens are figured on plates 52 and 53. 



In July 1916 large numbers of very small young were observed, but 

 no adult Florida-grown individuals were present. 



In January 1919 we found numerous young, but not a single adult 

 Florida-grown shell. 



