The subumbral ocellus of Aurelia is found to be of the inverted type, with the visual cones turned away from the light, as in Tiaropsis amongst Hydromedusae, and here also the pigment is furnished by the endoderm, forming a cup into which the ectodermal visual cells project (Schewiakoff ['31) In) the Stauromedusae tentaculocysts are either absent altogether, as in - St.
The distal club corresponds to the crystal-sac of an ordinary After Wladimir Schewiakoff, simplified from rhopalium, but bears a battery a coloured plate in Morphologisches Jahrbuch, of nematocysts in place of the xv., 1889, by permission of Wilhelm Engelotoliths.
Combined from three figures by Wladimir Schewiakoff in Morphologisches Jahrbuch, xv., 1889, by permission of Wilhelm Engelmann.
Schewiakoff, simplified from a coloured plate in Morphologisches Jahrbuch, xv., r889, by permission of Wilhelm Engelmann.
Schewiakoff, " Beitrge zur Kenntnis des Acalephenauges," Morph.