278 Wisconsin Academy of Sciences, Arts, and Letters. 



The shores support many of the smaller halophytic plants 

 found on these islands, and "large mangroves", probably Lagun- 

 cularia raeemosa, and Rhizophora Mangle, occur abundantly in 

 places. The older lava around the base of the mountain is cov- 

 tVed with forms usually found in the dry regions. There are 

 occasional specimens of an arborescent Cereus, and a low species 

 of Opuntia occurs abundantly around the base, and on the sides 

 of the mountain to an elevation of 1,600 ft. The trees in the 

 lower regions are mostly of Erythrina velutina and Bursera 

 graveolens, the last one of which was found to extend up to an 

 elevation of 1,700 ft. on the side of the mountain. Many bushes 

 and shrubs occur on the lower parts, but with the exception of 

 Lipochaeta lariciTolia, the names of these are not known. They 

 are probably all of species usually common on the lower parts of 

 these islands. Beds of "maidenhair fern", probably Adiantum 

 Henslovianum, were found in a lava cavern at the base of the 

 mountain. All together six species of ferns were noticed on this 

 part of the island, but it is very likely that many more could be 

 found if careful collecting were done in this region. Croton 

 bushes are abundant, and occur to an elevation of 2.300 ft. as 

 high as this mountain was explored by the members of the party 

 who visited this part of the island. A ' ' broad-leaved variety of 

 Croton", probably C. Seouleri var. grandifolius, occurs high up 

 on the side of the mountain, and "small-leaved varieties of Cro- 

 ton" occur around its base. There are one or more flows of re- 

 cent lava down the west side of the mountain which are bordered 

 by a heavy growth of bushes and morning glory vintfe around an 

 elevation of 2,300 ft. Above this there are forests which are ap- 

 parently made up of an arborescent species of Scalesia, and other 

 trees. Orchids, and '"sword ferns" were also noticed in the up- 

 per regions visited. 



Tagus Cove. 



Tagus Cove is located on the west side of the island about op- 

 posite the northeast corner of Narborougli Island. It has been 

 formed from and old tufa crater the southwest side of which has 

 been removed leaving a small and well protected bay inside. 

 The inner walls of the crater form steep bluffs which surround it 

 on all sides except the one open to the sea. In some places these 

 bluffs are 600 ft. high, but they are much lower than this towards 

 the nortli end of the cove at which place a small ravine enters it. 



