XVIII.—The Hydroids of the Scottish National Antarctic Expedition

The collection of Hydroids hereafter described was made in the years 1902–4 by the Scottish National Antarctic Expedition ship Scotia, during her cruises in Antarctic and sub-Antarctic seas. For the opportunity of examining the specimens I am indebted to Mr W. S. Bruce, the energetic leader of the expedition; and I also wish to thank Professor J. Arthur Thomson for much assistance and advice in the course of my work. The collection, as here described, coutains 41 specimens, of which 33 are referable to 27 known species distributed among 15 genera, some of them being new varieties; while the remainder have required the establishment of 7 new species and 1 new genus. One specimen remains specifically undetermined. Thus there are in all 18 different genera, represented by 35 different species.