. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. made at Naples in the ivinter o/" 1871-72. 89 eilia of the "Topfchen" are in no wise peculiar. What he has supposed to be a head or knob on the end of the ciliura is really nothing but the bending over of the extremity of the cilium under the influence of the dihite acetic acid which he used. I convinced myself time after time that the cilia of the Topfchen are perfectly normal, by study, with Hartnack's 10 h, immersion, of living specimens, and of others treate
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. made at Naples in the ivinter o/" 1871-72. 89 eilia of the "Topfchen" are in no wise peculiar. What he has supposed to be a head or knob on the end of the ciliura is really nothing but the bending over of the extremity of the cilium under the influence of the dihite acetic acid which he used. I convinced myself time after time that the cilia of the Topfchen are perfectly normal, by study, with Hartnack's 10 h, immersion, of living specimens, and of others treated with osmic acid. By the use of acetic acid I obtained the knob-like appearance which deceived Alexander Brandt. Further I have found out the source of the " ; They are to be observed in great numbers attached loithin the curious pair of tubes or vessels formed by duplicatures of the peritoneal membrane, which lie on each side of the oesophagus, and the connexion of which with the tentacle-crown was so well shown by Brandt in his memoir. They develop as " but- tons " on the cellular surface (fig. 3), which is throughout the perivisceral cavity provided in parts with patches of cilia-bear- ing protoplasm ; and then they become detached and swim off into the fluid. The whole history of this beautiful peritoneal Fig. tissue and its shedding of elements into the perivisceral fluid is of extreme interest; but I cannot go into it until my draw- ings can be given. So much for the Topfchen at present. Next as to the ova. These occur of all sizes in the perivisceral liquid; and Brandt appears to have supposed that they take origin in it. Various zoologists have tried to establish this or that structure as the " ; Some have assigned this nature to the pair of large brown tubes opening to the exterior, so paradoxical in character. MM. Keferstein and Ehlers mistook the unicellular cutaneous glands and some vagrant ova. Please note that thes
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