310 Wisconsin Academy of Sciences, Arts, and Letters. 



ception of the few mangroves, which grow uear 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, man.y of which extend 

 down nearly to the tops of the cliffs al>ove 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 

 toare. 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 wdth a brown colored epiphyte, probably a 

 species of FruUania. 



The interior of the smaller ef 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 heayj-- 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- 



