26 Annals of the Carnegie Museum. 



11. Jennings, O. E. "Notes on the Ferns of the Isle of Pines," 

 American Fern Journal, I, 191 1, pp. 129-136. 



In this article there is given a general account of the species col- 

 lected in 1910, with a discussion of their habitat and general distri- 

 bution on the island. There were included also lists of the ferns 

 collected on the island by Dr. J. F. Shafer, A. H. Curtiss, and Dr. C. 

 F. ]\Iillspaugh. 



12. Britton, N. L. "The Natural Vegetation of the Isle of Pines, 

 Cuba," Journal of the Neiv York Botanical Garden, XVIII, 1916, 

 pp. 64-71. 



A short account of the vegetation and general features of the 

 island, with particular mention of some of the more noteworthy or 

 striking species, a list of previous botanical collections on the island, 

 and a statement as to the general results of the Expedition of the 

 New York Botanical Garden in 1916. 



Physical Features. 



For the purposes of the present paper it suffices to say that the 

 Isle of Pines lies about sixty miles south of the west central portion 

 of Cuba, somewhat farther west than Havana, and has an area of 

 about eight hundred square miles. ^ The Island consists, generally 

 speaking, of a northern and a southern part, separated by a fresh- 

 water swamp which, to the east and west, passes into salt-water 

 marshes and mangrove swamps, the latter eventually opening out 

 into wide bays. 



The northern portion of the island is roughly elliptic in shape 



averaging about twenty-live miles in diameter. It consists of a 



low-lying and rather level plain, from which, in the noitheastern part 



of the island, the Caballos Mountains rise to a height of about one 



thousand feet. The mountains consist of crystalline limestone lying 



in thick strata which dip steeply to the east-northeast, the general 



trend of the ridges being from northwest to southeast. A short 



1 See in this connection the general discussion of the physiography and geology 

 of the island in Jennings, "Notes on the Ferns on the Isle of Pines," American 

 Fern Journal, I, 1911, pp. 129-136 and "A Note on the Geology of the Isle of 

 Pines," Journal of Geology, XXI, 1912, pp. 367-369; Britton, "The Natural Vegeta- 

 tion of the Isle of Pines, Cuba," Journal of the New York Botanical Garden, XVIII, 

 1916, pp. 64-67; also (mainly contributed by the present writer) the discussion 

 of the general natural features and vegetation in Todd, W. E. C, "Birds of the 

 Isle of Pines," Annals Carnegie Museum, X, 1916, pp. 146-296. 



