132 
OTTO C. GLASER 
DISCUSSION 
While the demonstrated identity of eolidian and coelenterate 
nettles is clearly not due to homoplasy, the actual occurrences are 
not so simply disposed of. Instinctively one wonders how such 
complex interrelationships betw^een two totally distinct sets of 
organisms could have come about^ and to what extent the pro- 
Fig. 10 Tangential {section through the cnidophore showing young cnidocysts 
enclosed in spaces limited by degenerating interstitialjcells. 
cesses described may be said to be adaptive. Before attempting 
to deal with the questions that arise, it will be well to summarize 
briefly what can be easily understood if the collected evidence 
is valid. 
If the accounts of Wright, Grosvenor, Cuenot and myself, are 
to be trusted, it is easy to see why the nematocysts should be 
found inside of entodermal cells and their derivatives: it is easy 
