FIGURE 65 in The non-Siphonophoran Hydrozoa (Cnidaria) of Salento, Italy with notes on their life-cycles: an illustrated guide

FIGURE 65. Halecium petrosum: A, fragments of hydrocladia with hydrothecae; B, detail of hydrothecal rim; C, fragments of hydrocladia with hydrothecae and female gonotheca, D, with male gonotheca (C, D same scale bar) (A, B drawn by C.G. Di Camillo; C, D redrawn and modified after Motz-Kossowska 1911). Scale bars: A, 0.5 mm; C, D, 0.5 mm.