NO. 6 



SMITHSONIAN EXPLORATIONS, I914 



39 



rounding of the base. There is one type of variation in which the 

 ribs are almost obsolete and very widely spaced. Another is darker 

 and narrower, and the ribs are much more crowded together. All 

 these various modifications in the new generation show that the 



w «* 



Fig. 40. — a, A typical planted specimen ; b and 

 c, two changes shown in the first generation of 

 Florida-grown specimens. 



Fig. 41. — Man-o'-war birds suspended on motionless wing on upthrust of 

 air above southeast corner of Fort Jefferson, Tortugas, Florida. 



somaplasm in the Cerions experimented with has been affected by 

 the new environment in which they were developed. 



