310 Wisconsin Academy of Sciences, Arts , and Letters. 
ception of the few mangroves, which grow near the shore, there 
was no other green vegetation worth mentioning. There were 
no trees of any kind, even the Bursera trees, which occur so 
abundantly in dry places on the most of the other islands, were 
entirely absent. This part of the island is covered with open 
thickets of bushes consisting of Cordia lutea, Gossypium barba- 
dense, Lantana peduncularis, and Prosopis dulcis. Opuntia 
galapageia occurs abundantly above 450 ft. elevation, on the 
northeast side, but it appears to be almost absent from the north 
side. The branches of this species are more loosely arranged 
than usual, and the plants have a rather sickly stunted appear¬ 
ance. Those which occur high up on the island are often heav¬ 
ily covered with fruticose lichens as is the most of the other vege¬ 
tation in this region. The vegetation thickens up considerably 
around 500 ft. elevation, on the north and northeast sides, and 
consists mostly of Croton bushes. 
The east side of the island is very rough and covered in places 
with long ridges of rough broken lava, many of which extend 
down nearly to the tops of the cliffs above the sea. The vegeta¬ 
tion on these parts consists mostly of Croton and Prosopis 
bushes to an elevation of 750 ft. Above this elevation the vege¬ 
tation is more open, however, and there are areas which are cov¬ 
ered with small plants, and occasional bushes of Acacia macra- 
cantha, Prosopis dulcis, and Zanthoxylum Fagara. The south 
sides of many of the large lava boulders in this region are cov¬ 
ered with Polypodium squamatum, while the north sides are 
bare. This is probably due to the fact that the south sides of 
these boulders are bathed by the moist winds during several 
months of the year, while the north sides are not. The south 
side of the island was not visited but from a high point it ap¬ 
peared to be covered with a dense growth of bushes, many of 
which were covered with a brown colored epiphyte, probably a 
species of Frullania. 
The interior of the smaller cf the two craters was not visied, 
but the inner walls appared to be covered with Croton and other 
bushes, all of which were heavily covered with lichens. The 
floor had a few bushes on it but the growth is not heavy enough 
to hide the soil in most places. The floor of the larger crater, 
to the south of the smaller one, is sparingly covered with Opun¬ 
tia galapageia, and bushes of Prosopis dulcis, and Zanthoxylum 
Fagara. In low places around dried pools there was an abun- 
