34 



EXPERIMENTS IN THE BREEDING OP CERIONS. 



Table No. 16. — Check series of Cerion casablancw. 



In 1914 a house was built in the midst of our plantation, but this has 

 not materially affected this planting; 50 young secured in April 1914 

 were taken to Sands Key to start a new colony. 



In June 1915 we secured 23 adult specimens of the first generation of 

 Florida-grown shells, which we measured and photographed, together 

 with 45 young, varying from a quarter-grown to almost adult, on the 

 same sand ridge upon which the original planting was made, but about 

 50 feet to the north of it. Later we discovered 13 additional adults of 

 the first generation, which we hkewise marked and added to this 

 planting The 23 specimens photographed are represented on plate 

 35 and their measurements are given in table 17. 



In 1919 we found that the key had been transferred to a new pur- 

 chaser, who was cutting off the bushes. Most of the ground containing 

 our second plantation had been completely burned over and we were 



