hemselves. Therock not be difficult to make. In the course of such a study an important point in showing that the habit under is gradually hollowed out into a cavity of variable di- it would be interesting to observe the relations of the consideration is not the characteristic of any species in… … saw a number of cavities formed by the usual me- SEA URCHIN. BURROW. chanismn (wear of the rock by stones set in motion by Naturalist of January, 1890, has taken up the study of the niches, and to find out whether there is not herea waves and currents), and in the sides of these he ob- fact in the…
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