180 CARNEGIE INSTITUTION OF WASHINGTON. 



On May 19 we visited Indian Key, where we found the cerions doing well 

 at both plantings. We gathered 18 living adult specimens of the first gen- 

 eration of Florida-grown individuals, and 31 of the originally imported 

 specimens of the second planting. The Florida-grown individuals we 

 measured and marked and placed about 5 feet east of the stone wall which 

 is a remnant of a house on the eastern end of the key, while we replanted the 

 31 Bahama specimens a little west of the center of the second stone wall. 

 The original planting, which we found completely swamped by a rank growth 

 of vegetation two years ago, appears to have survived quite well, and this 

 year the drought has been so great that the grass has been dried up to a 

 great extent, even the cacti having a shriveled appearance; and this enabled 

 us to see that the cerions had survived. We found 29 of the originally 

 planted material, 49 adult Florida-grown individuals, and 15 young tips. 

 We planted the Florida-grown individuals in one place at the inner edge of 

 the grass, about 45 feet east and a little to the left of the stone wall, 

 looking landward. 



We next visited Tea Table Key, where a thorough search revealed not a 

 single cerion. They have evidently all been destroyed and carried away by 

 the crabs. The island was completely overrun by crabs two years ago, 

 though now they seem to be practically absent. 



On May 20 we visited Duck Key and found that part of the key where 

 our cerions are planted so heavily overgrown with Bahama grass that it was 

 impossible, in walking about, to reach the ground. The grass underfoot 

 gave one the impression of walking on a thickly felted carpet. It was 

 exceedingly difficult to detennine whether any cerions remained. A long 

 search yielded only 4 specimens, of which 3 belonged to the originally planted 

 material. The single Florida-grown individual has a peculiar aperture and 

 was reserved for the collection, while the other 3 were left at the planting. 



We next visited Bahia Honda and found the old planting doing well. 

 We gathered 22 full-grown specimens of the first Florida generation. Some 

 of these shells were found fully 150 feet from the stake where the original 

 planting was made. Not a single specimen of the originally transplanted 

 material was found. It is quite possible that most of these perished in the 

 fire to which we referred last year, which completely swept the region. This 

 year's findings were largely confined to the inner edge of the ditch. The 

 colony of the first generation of Florida-grown individuals which we planted 

 on the seaward side of the ditch seems to be completely hidden in the very 

 dense growth of Bahama grass and it will be necessary to cut this next year 

 in order to collect the snails. 



On May 22, at Newfound Harbor Key, we found that the colony on the 

 upper ground, that is, the ridge upon which Ave had transplanted the colony, 

 had been recently burned over, leaving the place quite bare. Here we 

 discovered only a single specimen of the originally planted Bahama cerions 

 and one locally grown individual. In the low fiats, where we made our 

 first planting, we found 51 individuals, which represent the first generation 

 of Florida-grown specimens, and 3 of the originally planted colony. 



We wore suipriscd to find 4 shells which are undoubtedly hybrids between 

 the introduced sy)ecies and the native Cerion incanum. These were taken 

 from l)ushes on whicli both introduced and local forms were present. These 

 4 specimens were taken to Washington for further observation. The remain- 

 ing specimen we placed in a cluster of stumps about 30 feet west of the 

 large trees in the open plain, and marked the place with a stake. In this 

 connection it might be well to say that Avhen we made the first planting no 

 specimens of the Florida cerions were observed on the island. If we had 

 found them I doubt if we would have placed a colony on this little key, as 



