250 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Narbokough Island. 



In proportion to its size and interest Narborough has received the 

 least botanical attention of any of the islands. This is to be regretted, 

 as it is not only the most remote from the mainland, but is much shielded 

 by the neighboring long and lunate island Albemarle from any direct 

 drift from the other islands or from the continental coast. Although it 

 is to be expected that Narborough would on this account possess a 

 decidedly peculiar flora, the single collection made there by Messrs. 

 Suodgrass and Heller and including 59 different plants, contains only 

 4 species confined to the island and only 26 which are confined to the 

 archipelago. Thus the percentage of peculiar and strictly Galapageian 

 plants is less rather than moi-e than on the other large islands. This 

 lack of peculiarity may well be due to recent volcanic activity on Nar- 

 borough, since this would tend to impoverish the fldra except as it was 

 replaced by recent immigration from the other islands. 



The Seymour Islands. 



North and South Seymour are two islets lying just north of Inde- 

 fatigable, from which they are separated by channels only 1 or 2 km. 

 broad. They are of relatively low altitude. South Seymour is some- 

 what larger than North Seymour and lies directly between it and 

 Indefatigable. The* Seymour Islands have been visited for botanical 

 purposes only by Messrs. Snodgrass and Heller, who collected upon 

 the north island 18 plants and on the south 34. As upon the adjacent 

 Indefatigable no ferns have been found on the Seymour Islands. On 

 South Seymour there are 2 endemic species not known to occur upon the 

 other islands, namely, Biirsera vialacophylla and Euphorbia nesiotica, 

 while North Seymour has an as yet indeterminate plant {Nyctaginaeeaf) 

 which may well prove peculiar to it. It is noteworthy that less than 

 half the plants of the Seymour Islands have as yet been found upon 

 Indefatigable, near as it is ; indeed the common element is considerably 

 greater with the much more distant islands of Charles, Chatham, and 

 Albemarle. Halophytes form a noteworthy f)art of the vegetation of 

 the Seymour Islands. 



Tower Island. 



Tower is a small triangular island some 3 km. in breadth. It lies at 

 the northeast of the main archipelago and is nearest Bindloe, which is 



