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Report on the Bahama Cerions planted on the Florida Keys. 209 
NEW COLONIES STARTED ON THE FLORIDA KEYS IN 1914. 
1. New ImportTaATIONS FROM THE BAHAMAS. 
On June 9 the Director, at my request, planted on the Tortugas 
the following newly imported material from the Bahamas: 
Two hundred specimens of mottled cerions, plate 6, from Spring 
Hill, about 6 miles east-southeast of Nassau, New Providence, each 
marked with two file scratches on the second from the last whorl and 
with two notches in the outer lip, were planted about 75 feet from the 
southeast corner of the main (new) laboratory building on Loggerhead 
Key, and the place marked with a wooden stake bearing a lead label 
upon which is stamped ‘“‘Spring Hill, Nassau, 1914” (plate 7p). Of 
this planting Dr. Mayer wrote, August 20, 1914: “I fear that all died 
at Tortugas, for I could find none of them on the bushes, but all lying 
on the ground, in July.” 
Five hundred of the “Kings Road Type” were marked with two file 
scratches on the last whorl and planted on the southern end of Logger- 
head Key, 8. 24° W. from the long entrance stake, and S. 80° W. from 
the double stake which marks the 1912 ‘‘ King’s Road Type” cerion 
planting (plate 8r). This colony was marked by a stake bearing a 
lead label with the legend, ‘‘ Bastian Point, Andros, 1914.” 
2. TRANSPLANTATIONS OF THE FirsT GENERATION OF FLORIDA-GROWN SPECIMENS. 
These new colonies, mentioned previously, are to enable us to keep 
track of the various generations and to observe the reaction of each to 
the changed environment. They are on the second Ragged Key north 
of Sands Key, Sands Key, Bahia Honda, and Loggerhead Key. 
OBSERVATIONS ON THE ADULT SPECIMENS OF THE FIRST GENERATION OF 
FLORIDA-BORN INDIVIDUALS. 
The largest specimens of Florida-grown cerions found last year 
possessed seven postnuclear whorls, which make up about half of the 
entire length of the shell. From the study of these young specimens, 
we were led to make the statement that ‘‘ The results sofar obtained seem 
to indicate that the first generation will be like the parent generation 
unless decided changes should take place in the later whorls, which 
have as yet not been developed. * * * If the present tendencies 
prevail in the adult shell, then we can say that the somaplasm has not 
at once responded to the change of environment.”’ 
The adult specimens of the first generation of both races of Florida- 
grown individuals now enable us to say that a decided change has taken 
place; that the first generation is not like the parent generation, show- 
ing that the somaplasm in both of the races of cerions subjected to 
experimentation has responded to the new conditions in which they 
were developed. The extent to which changes have taken place is well 
shown by the illustrations accompanying this report. 
