28 A NATURALIST ON THE "CHALLENGER." 



large black Holothurians, are excessively numerous. They are 

 to be seen covering the white sandy bottom all over, lying a few 

 feet only apart. 



I was greatly indebted during my stay at the Bermudas to 

 General Sir J. H. Lefroy, C.B., F.K.S., then governor of the 

 islands, both for his kind hospitality and constant information 

 and assistance in scientific matters. 



For a further account of the geology of the Bermudas, see " Nautical 

 Magazine," 1868, p. 486, and also J. M. Jones, F.L.S. on the " Geological 

 Features of the Bermudas." Trans. Nova Scotian Institute of Nat. Hist., 

 May, 10, 1869. 



For the Mollusca, Bev. H. B. Tristram, Froc. Zool. Soc, 1861, p. 403. 

 For the Birds of Bermuda, Lieut. Beid, E.E., F.Z.S., "Zoologist," 1877. 

 Bepr. from the "Field" newspaper. 



For a general account of the Natural History of the islands, see " The 

 Naturalist in Bermuda," by J. M. Jones, F.L.S. London, 1859. 



For the Vegetation, see Dr. Bhein, " Ueber die Vegetations- Verhalt- 

 nisse der Bermudas-Inseln." Vortrag gehalten beim Jahresfeste der 

 S.N.G., 25. Mai, 1873. Also papers on collections made by me in the 

 Journal of the Linnean Society, for which see the list of papers at the end 

 of this work. 



