Note 483 — Chapter XVI · LAND AND FRESH-WATER SHELLS.
Reading edition
In St. Christoval I found this species on one occasion 150 feet above the nearest stream.
[484] This species often takes to the water. Some individuals that I kept alive on board used to spend a quarter of an hour at a time in the water eating voraciously all the while.
[485] According to Prof. Semper, these two species in the Philippines live a large portion of the year high up on the trees in mangrove swamps. (Ibid.)