PLATE 6 



Fig. 1 Electra pilosa, long si)iiied phase. 



Fig. 2 Callopora aurita, infertile zooeeia near center of zoarium. 



Fig. 3 The same, fertile zooeeia, note position of avicularia in absence of 

 ooecium in lower right corner. 



Fig. 4 Callopora craticula, the zooeeiuni in the upper left corner shows the 

 spines in their most characteristic form. 



Fig. 5 Tegella arctica, highly calcified. 



Fig. 6 Callopora dumerilii, details of zooeeia. 



Fig. 7 Tegella unicornis var. armifera, details of zooeeia. 



Fig. 8 Amphiblestrum flemingii, usual appearance with avicularia. 



Fig. 9 The same, zooeeia crowded and without avicularia. 



