The porifera and coelentera . and the gonads areborne, as in all Anthomedusae, on the maiuibrium. Theresemblance of Ctenaria to the Ctenophora is quite has only to compare the eight nematocyst stripes of the onewith the highly specialised ciliated costae of the other to see their ^ Eine neue hochst interessaute pacifische Form, Ctenaria ctawphora, welcheich als eine unmittdhare Uebcrgangsform von Gemniaria-iilinliclien Anthomedusenzu Cydippe-iihnlichen Ctenophoren auffassen muss. 14 THE CTENOPHORA essential difference, and, for the rest of it, nematocysts do notoccur in the Cte
The porifera and coelentera . and the gonads areborne, as in all Anthomedusae, on the maiuibrium. Theresemblance of Ctenaria to the Ctenophora is quite has only to compare the eight nematocyst stripes of the onewith the highly specialised ciliated costae of the other to see their ^ Eine neue hochst interessaute pacifische Form, Ctenaria ctawphora, welcheich als eine unmittdhare Uebcrgangsform von Gemniaria-iilinliclien Anthomedusenzu Cydippe-iihnlichen Ctenophoren auffassen muss. 14 THE CTENOPHORA essential difference, and, for the rest of it, nematocysts do notoccur in the Ctenophora.^ The sub-umbrella cannot be compared ?either in its development or in its adult relations to a stomodaeum. ?There is a superficial resemblance between the gastro-vascularsystem of the two forms, but even if we pass over the absenceof anything representing the manubrium and oral tentacles inCtenophora, we find an essential difference in that the endodermlamella, in which the radial canals of the Anthoniedusan are. IKi. V. Cteiiarla ctenojihont, Ilaeckcl. A, side view ; H, two horizontal views, that to the leftrepresenting the snrfiice of the aboral heniisi)liere, that to the right a section jwissing nearlyequatorially. a, the right acliadial ridges of nematocysts; h, iiiesogkva of the unihrella;c, circnlar muscle of the umbrella ; rf, longitudinal muscles of the umbrella ; c, the gastralcavity ; /, the sixteen oral tentacles; ri, the four i)erradial gonads borne on the manubrium ;h, the four jierrailial gastrovascnlar canals ; i, the eight adradial bifurcations of the preceding ;A, ring canal at the umbrellar margin ; /, velum ; hi, pocket-like cavities in the exninbrellasituated at the Imiscs of the tentJich-s ancl lined with nematocvsts ; », the tentacles; o, theui>per moiety of the gastial cavity, called by llaecki-1 the infundibulum. hollowed out, is entirely unrepresented in the Ctenophora. Noris there any ring canal in the latter group. The tentacles ofCtenari
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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectctenophora
