The porifera and coelentera . ? 1 \Wr^. Fig. 43«. Skeletons of Allopora (upjier left hanil), Errina (lower left liatid), andStylaster (right hand). large complex nematocysts; they are composed of the usual bodylayers, and are connected at their bases with the tubular coenosarcby radiating tubes. The structure of the (jonophores (Hickson, 38) varies considerablyin different genera, but is apparently in all cases referable to asimplification of the medusoid type, such as has been sketched inAnthomedusae (p. 20). The gonophore is not known to be everfreed; it develops neither velum, tentacles, mo
The porifera and coelentera . ? 1 \Wr^. Fig. 43«. Skeletons of Allopora (upjier left hanil), Errina (lower left liatid), andStylaster (right hand). large complex nematocysts; they are composed of the usual bodylayers, and are connected at their bases with the tubular coenosarcby radiating tubes. The structure of the (jonophores (Hickson, 38) varies considerablyin different genera, but is apparently in all cases referable to asimplification of the medusoid type, such as has been sketched inAnthomedusae (p. 20). The gonophore is not known to be everfreed; it develops neither velum, tentacles, mouth, nor sense organs;a manubrium is not invariably present. In Millepora Murrayi thegonophore is formed at the apex of a dactylozooid (cf. Limnocodium,Scyphistoma), in the other forms hitherto investigated it is formed 38 THE HYDROMEDUSAE on the course of the coenosarcal canals, and often lies in a special})it of the coonenchyme, termed the ampulla. An entocodon is notformed in the usual way ; instead of this, which is an ectodermald
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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectctenophora
