208 Papers from the Department of Marine Biology. 



The colony at the southern end of the island (plate 8 E) appears to 

 be in equally healthy condition. We gathered 300 young specimens, 

 some of which are figured on plate 5, upper figure, and 3 full-grown and 

 3 nearly full-grown individuals which were born here (plate 3, top 

 row). The young were planted in the small meadow a little to the 

 northeast of the one in which the original colony of the "King's Road 

 Type" cerions were planted (plate 8 G). This new colony is on a ridge, 

 in a scanty growth of Bahama grass, and the place is marked by a stake 

 bearing a tag with the legend, "Cerions Z." 



The middle planting (plate 8 H), which consisted of 500 each of the 

 "King's Road" and "White House" types, is not doing well. Part of 

 the ground has been burned over and quite a number of the snails were 

 destroyed. Most of the living individuals had taken to the fringe of 

 bay cedars, and these do not appear to form a particularly suitable 

 habitat. We cleaned the place up thoroughly, pulling up the cactus 

 and cutting the grass, thus making an exhaustive search, which resulted 

 in the recovery of 200 of the "White House Type" and 150 of the 

 "King's Road Type" cerions, and a single tip. These were transferred 

 into the second meadow northwest of the original south colony (plate 

 8 i) . This mixed colony is marked by a stake bearing a tag with the 

 legend, "Cerions XX." The ground here is covered by a quite regu- 

 larly distributed growth of short grass. 



April 29, 1914- We visited Boca Grande and examined the colony 

 planted about the beacon. The grass here had been burned over and 

 most of our specimens roasted. Quite a number of young, however, 

 were present in the tufts of grass not consumed by fire, so this colony 

 still promises to maintain itself. Three adults and one nearly grown 

 (plate 3, the last four figures, bottom row) of the first generation were 

 obtained and reserved for further study. 



The status of the various original plantings may therefore be briefly 

 described as follows: 



King's Road Type: Second Ragged Key north of Sands Key, good; Tea 

 Table Key, probably extinct; Duck Key, undecided; New Found 

 Harbor Key, almost extinct; Boca Grande Key, good; Garden Key, 

 Tortugas, almost extinct; Loggerhead Key, Tortugas (plate 8 E), very 

 good. 



White House Type: First Ragged Key north of Sands Key, good; Indian 

 Key, very poor; Bahia Honda, very good; Loggerhead Key, Tortugas 

 (plate 7 A), very good. 



Mixed lot: Loggerhead Key, Tortugas (Plate 8n), as yet poor. 



