38 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 65 



stock. Also the first generation shows a wider range of variation 

 than the parents. 



Fig. 39. — Bahama Cerions on Duck Key, Florida. 



This departure from the parent generation is shown in the shape, 

 coloration, and sculpture of the shells (fig. 40). The tendency of 

 the whole lot is toward elongation, and toward the attenuating and 



