FIGURE 53 in On a collection of hydroids (Cnidaria, Hydrozoa, Hydroidolina) from the west coast of Sweden, with a checklist of species from the region 3171

FIGURE 53. Obelia geniculata: part of colony with a hydrotheca and a gonotheca, ROMIZ B3924. Scale equals 0.5 mm. FIGURE 54. Obelia longissima: part of colony with three hydrothecae, ROMIZ B3889. Scale equals 0.5 mm.