Dammerman: Fauna of the Krakataa Islands. 95 



The comparison with the fauna of Sebesy proved that the fauna of 

 this island is only slightly in advance of, and has been destroyed 

 apparently in the same degree as, that of Krakatau at the eruption 

 of 1883. 



6. Dispersal through the air either actively by animals on the wing, or 

 passively by wind or air currents, probably carries most weight, but 

 also by ocean currents far more animals, like Myriapoda, Arachnida 

 and terrestrial Crustacea and Mollusca, can be dispersed than is generally 

 accepted. 



7. From the presence of the last-mentioned animals on an island it may 

 not always be concluded that there has existed in past times a land 

 connection with other islands or a continent. Also the existence of 

 archaic species on an island does not always prove that it is of 

 great age. 



8. There is some evidence that we can witness the origin of new insular 

 forms on Krakatau, but the lapse of time between the eruption and 

 the present investigation is certainly too short for observations of 

 this kind. 



Conclusions of the same kind, as put in the above theses 4, 6 and 7, 

 have already been drawn by JACOBSON from his investigations in 1908. 



