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Esimerkit

• The genus Retepora was first established on account of the anastomosing reticulate zoarial growth; but it has become quite clear that this is not a satisfactory character, since species have been found which are simply foliaceous with the zoœcial features of Retepora. Although our ideas of the importance of reticulation have quite changed, I maintain that we have here a natural group based upon zoœcial characters, though unaware of any one character which is absolutely constant.