 The idea is that “cat” and “dog” may both be individuated by the same criterion, so the fundamental criterion is not only associated with them but with other substance sortals that fall under the same ultimate sortal. We know from Wiggins’s remarks that “animal” is not a sortal, so the ultimate sortal for “cat” and “dog” is somewhere in the hierarchy above those concepts but below “animal”. Surprisingly, given the centrality of this notion, Wiggins nowhere gives an example of what he regards as an ultimate sortal. (At 1980: 123 he does speculate inconclusively that “man” might be the ultimate sortal for Julius Caesar.)