Species of Schizotricha Allman, 1883 (Cnidaria, Hydrozoa) from recent antarctic expeditions with R.V. 'Polarstern', with the description of a new species

Five species of the genus Schizotricha Allman, 1883, one of which is new to science, have been studied. The material originates from the Weddell Sea region and from off Elephant Island and it was collected during several antarctic expeditions with the R.V. Tolarstern'. Each species is described and figured and its systematic position among allied species discussed. The type material of Schizotricha glacialis (Hickson & Gravely, 1907) and S. turqueti Billard, 1906 has been re-examined and is also described and figured.