206 Papers from the Department of Marine Biology. 
on the sea side. There are two lesser dead trees, one on each side of 
the taller. The specimens were placed in a patch of grass near the 
base of the outer dead tree, apparently a very favorable habitat. The 
distance of this key from the first Ragged Key north of Sands Key is 
only a few hundred yards; hence the environmental conditions are 
probably very nearly the same in the two places. 
April 22, 1914.—Visited Tea Table Key, and found no living cerions, 
and only afew dead. Apparently this colony is doomed to extinction. 
The island is infested with crabs, being riddled with their burrows, 
and the small hermit crabs have probably carried off most of the shells. 
On Indian Key, 20 of the dead specimens were still on the wall where 
we placed them last year, and 2 more were at the base where the 
majority were strewn. A thorough search revealed only 13 living 
specimens, so this colony also is on the verge of extinction. No young 
individuals were found in this second planting. We next visited the 
place where the original planting was made—the place which was so 
completely overrun with vegetation last year that it was deemed wise 
to shift the colony a little further inland. The vegetation is even more 
dense than last year and it was impossible to determine if any had 
survived here. 
April 23, 1914.—In the colony on Duck Key, 107 of the marked 
shells were recovered, all but one alive. Many of these were copulating. 
We found only one young specimen, but the vegetation here is so dense 
that the small young could easily escape notice. The young indi- 
vidual obtained possessed only one postnuclear whorl. All the shells 
were put near the stake where we planted them last year, and it seems 
quite possible that this colony may survive. 
The colony at Bahia Honda is doing well. We gathered 46 marked 
specimens—all that we could find—and took them westward to the 
summit of a little promontory, dropping them between the stumps of 
two palms and marking the place with a stake. Across the ditch from 
this stake stands a large palm. We did not wish them to mingle with 
their grown or growing offspring, which are very abundant on this 
plantation. We gathered 105 of the young and placed all but 13 at the 
base of the old stake. The 13 are full-grown, or nearly so, and these 
we took with us in order to compare them with the check series. (Plate 
1, bottom row.) Even in the field the Florida generation appeared so 
remarkably different from their Bahama-born parents that we could 
distinguish them the moment we saw them. 
On New Found Harbor Key the ground where the planting was made 
was swamped with a dense growth of some malvaceous plant which 
was overgrown with a leguminous climber. Only 11 planted specimens 
were found, and no young. The place was so fearfully infested with 
mosquitoes that a long stay and exhaustive search was impossible, but 
from observed facts I would say that this colony was not prospering. 
