334 Wisconsin Academy of Sciences, Arts, and Letters. 



the island are very steep. A pebble beach extends along a por- 

 tion of the north side, near which there is a small salt water 

 lake surrounded on the sides by a small area of level land. 

 There are three peaks on the island which vary in height from 

 950-1,050 ft. The flat area near the shore is covered with dark 

 red soil mixed with bits of lava, but the steep sides have very 

 little soil on them, except in low places and in crevices of the 

 lava. The sides in places are strewn with small lava boulders. 



Low bushes of Cryptocarpus pyriformis grow along the beach, 

 while around the lake there are small trees of Avicennia officin- 

 alis, and Laguneularia racemosa. Tangled thickets of Discaria 

 pauciflora with very long stiff spines, and bushes of ^Maytenus 

 obovata occur just above the lake on the side next to the land. 

 There are many small trees of Bursera graveolens, and Opuntia 

 myriacantha scattered over the lower part of the island. The 

 first of these species gradually disappears higher up, while the 

 second becomes very much reduced in size, appearing at the top 

 in a more or less decumbent form. The steep sides of the island 

 are covered with bushes which consist chiefly of Croton Scouleri, 

 and Waltheria reticulata. All of the vegetation, above an ele- 

 vation of 450 ft., is heavily covered wdth frutieose lichen indicat- 

 ing a somewhat greater amount of moisture than lower down. 



The vegetation has a decidedly stunted appearance around the 

 summit, and with the exception of a single species of fern. Poly- 

 podium squamatum, all of the other plants are distinctly dry- 

 region forms. There are no trees at the top, and the bushes 

 which occur there, are usually low and more or less prostrate. 



Narborough Island. 



Narborough, the third largest island in the group, is situated 

 just west of Albemarle Island from which it is separated by a 

 shallow channel about two miles wide at its narrowest point. 

 The northern end of the island is nearly' opposite Tagus Cove on 

 Albemarle Island. A large crater, probably over 5,000 ft. in 

 height is situated somewhat north of the center, and there is a 

 gradual slope upward from the shore to the base of it on all sides 

 but the north. The outer walls of the crater rise abruptly on 

 the north side, and are almost perpendicular in places. There 

 is a broad flat plain of old lava at the base of the crater on this 

 side. 



