 | National Academy of Sciences (U.S.) - 1916 - 812 strani
...an effective factor in colonization before Tertiary times, for otherwise it seems unaccountable that all dominant Tertiary snails of the continents are...as with our present knowledge, they appear to be. There is small reason for believing that supposed means of mollusk transportation which have failed... | |
 | Forest Buffen Harkness Brown - 1922 - 166 strani
...same time, the modern families (Helicidae) are absent from the islands. Pilsbry remarks (p. 431) : "If Pacific faunas were derived . . . from waifs drifted...have existed in the past in spite of the fact that it is "heterodox to doubt the absolute permanence of oceanic basins." It is obvious that the same agency... | |
 | National Academy of Sciences (U.S.) - 1916 - 788 strani
...an effective factor in colonization before Tertiary times, for otherwise it seems unaccountable that all dominant Tertiary snails of the continents are...as with our present knowledge, they appear to be. There is small reason for believing that supposed means of mollusk transportation which have failed... | |
 | National Academy of Sciences (U.S.) - 1916 - 788 strani
...an effective factor in colonization before Tertiary times, for otherwise it seems unaccountable that all dominant Tertiary snails of the continents are...as with our present knowledge, they appear to be. There is small reason for believing that supposed means of mollusk transportation which have failed... | |
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Pacific faunas were derived as has often been claimed, from waifs drifted thither on 'natural rafts' or carried by birds from the continents, such migration must have stopped as an effective factor in colonization before Tertiary times, for otherwise... 