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Treubia Vol. Ill, 1 



3. From where did the present species arrive and how have they reached 

 the islands ? 



4. Have local forms already originated on the islands? 



1. The sequence in which animals have reached the islands. 



Unfortunately zoologists have not interested thomselves enough in 

 Krakatau. The fauna was not studied thoroughly for the first time until 

 25 years after the eruption, so it is quite impossible to answer the question 

 which animals have reached the islands first ? 



Sluiter, who paid a short visit to Krakatau in November 1888 and 

 July 188Q, turned all his attention to the problem of the new growth of 

 corals around the devastated island. He writes that time was not available 

 to study the land fauna, which is most to be regretted. He was also on 

 Krakatau before the disaster, namely in 1880, at which time narrow coral 

 reefs were to be found at different localities, but during the eruption of 

 1883 all these were destroyed or covered by a layer of pumicestone and 

 ashes as thick as 20 M. and more. In 1888 there was already a new reef 

 growing in the bay of Zwarte Hoek (Black Hillock, see Map Fig. 1). 



LA 



I 



zw. HOEK 



t 

 t 





Fig. L Map of the Krakatau Islands, Scale 1: 125.000. 

 Dark lines indicate the present condition of the islands; the dotted 

 lines the coastline shortly after the eruption (after Verbeek). 



