Most genera of Bryozoa are widely distributed, and there are many cosmopolitan species, so that the Bryozoa fauna from any one locality has some considerable similarity with all others, but in comparing the Arctic and Antarctic fauna to see to what extent, if any, the bipolar theory receives support, it is not enough to show, that there are some similar forms, for this we should certainly expect, but what we want to know is, whether there is more similarity between the Arctic and Antarctic than between the Arctic and subantarctic faunas ; then we can carry on our comparisons to Southern Temperate, proceeding to tropical regions and thence on to Northern Temperate. [NOT CONTROLLED OCR]