DEPARTMENT OF MARINE BIOLOGY. 195 



more shady and probably more moist near the ground than those which exist 

 in their original habitat along King's Road on Andros Island, Bahamas. 



The colony at Newfound Harbor Key was not examined on account of its 

 poor condition last year. 



On June 25 we stopped at Boca Grande Key, where we found 119 of the 

 first generation of Florida-grown specimens of the " Kings Road type." These 

 we took to the Tortugas for photographing and measurement; all but 4 were 

 returned to Boca Grande, where 103 adult and 9 young, duly marked, were 

 planted about 300 feet south of the beacon, a little nearer the bushes than the 

 shore, in a straight line inland from the Toiirnefortia bush which stands on 

 the edge of the shore. The 4 specimens were reserved for the collection at 

 Washington. 



The colonies on the Tortugas were subjected to an examination between 

 June 27 and 30. Here numerous adult specimens of the first generation of 

 Florida-grown mollusks were found, but so far no adult specimens of the second 

 Florida generation have appeared. 



The status of these colonies may be summarized as follows : 



Colonij A. — The original planting of "White House type" cerions has spread 

 considerably and is doing well. Adults and young of various sizes were seen 

 everywhere within a radius of 50 feet from the stake marking the spot where 

 they were placed in 1912; they have taken to the fringe of bay-cedars and 

 have even crossed the path and arc in the bushes to the west of it, but prefer 

 the grass in the shade of the shrubs. Of the 162 marked specimens which we 

 returned to the stake last year, 56 were found dead at the base of the stake; 

 16 marked, living specimens of the original planting, and 271 adults and 47 

 young Florida-grown individuals, the latter ranging from a quarter-grown to 

 almost adult, were easily collected ; these v/e placed near the stakes marking 

 the original planting-place. The young individuals may represent first or 

 second generation of Florida-grown cerions, and for this reason we shall pay 

 no more attention to them, but shall permit them to mingle and develop undis- 

 turbed. A young individual of 9.5 whorls is a giant, measuring 14.2 mm. in 

 diameter. 



Colony B. — Here 500 tips of Florida-grown ''White House type" cerions, 

 offsprings of colonj^ A, were planted last year. We recovered 125 full-grown 

 or almost full-grown, and 14 immature specimens. These were measured, 

 marked, and replanted as colony J, in a little clearing on the east side of the 

 path halfway between the laboratorj^ and colony A. We marked the place 

 with a stake bearing the legend "Cerions 1915 J." 



Colo7iy C. — Here we planted 100 marked specimens, offsprings of colony A, 

 m 1914, ranging from one-quarter to three-quarters grown. Of these, now 

 adult, we recovered 36 this year, which were carefully photographed and 

 measured, then returned to the same place, since there is no danger of a 

 commingling between first and second generation individuals, as no second- 

 generation specimens have as yet appeared. 



Colony D. — On June 9, 1914, at my request, 200 specimens of mottled 

 cerions, imported from Spring Hill, 6 miles southeast of Nassau, New Provi- 

 dence, were planted about 75 feet from the southeast corner of the main labora- 

 tory building on Loggerhead Key. We were this year unable to find a single 

 specimen in the place where these shells were planted, and it is quite possible 

 that they have been carried off by small hermit crabs, although some of them 

 may be buried in the sand. We shall look for them again next year. 



Colony E. — This is the original "King's Road type" cerion planting at the 

 south end of the island, and is doing remarkably well, spreading rapidly north- 

 ward in the little meadow. We found some of the specimens 115 feet from the 



