Plate V. 



1. Calycella syringa, enlarged (after Hincks), p. 98. 



2. Halecium halecinum, nat. size. 2a, Calycles en- 



larged, p. 102. 



3. Sertularella polyzonias, nat. size. 3a, Calycles en- 



larged, p. 106. 



4. Sertularella Gayi, nat. size. 4a, Calycles enlarged, 



p. 107. 



