96 



or on the modes of connection of the zoa-cia. In their whole structure these forms 

 undouhledly belong to the family BiceUurwUte. The peculiar contrast in Episto- 

 mia and Sijiiiiotiim^ between the proximal cylindrical and the distal widened 

 portion of the zmecium as well as the possession of |)e(lunculate avicularia, shows 

 that the position of these genera is near lo (lormicopiiui. hi Gemellarid the dislal 

 wall is as in Biu/iilci: angulale and furnished with a series of uniporous roselte- 

 plales. We also find an angular distal wall in Didymia, the oa-cia of wliicli, like 

 those in Einrateo and Coniiicopiiia, are surrounded by kenozooecia, and Dimetopia 

 has like most of the Bicellariidae, free orocia. Finally, I have been obliged to 

 set up new genera for the old F/«s/r«-species, Fl. nohilis, Fl. dissiniilis and Fl. 

 militaris as also for BiujiiUi Mnrraijnna, BicelUiria Alderi and ('.iilewtiia" hicornis. 

 It is however with some doubt that I refer the last sjiecies lo Ihis family. 



In the following synopsis of the numerous genera of Ihe family, lo which 

 I have been ijnder the necessity of adding 6 more, I have as main characters in 

 the separation of the genera mainly used diderences in the structure of the zoa'- 

 cia themselves, as e. g. the presence or absence of an operculum, the division of the 

 zooecium in different segments by constrictions, the structure of the dislal wall, 

 and next the differences in the character of the occcia. I have used the piesence 

 or absence of ooecia and avicularia, as well as Ihe dilVerences in the structure 

 of Ihe avicularia, as auxiliary characters. 



Synopsis of the Genera. 



1) The colony consists of two layers, the zowcia of which are of 

 very different kinds (Ihe zod'cia in one layer are quite uncalcilied, 

 without operculum, in the olher layer they are of the ordinary type; 

 the distal wall consists of a horizonlal. basal iiorlion wilh a mulli- 

 porous roselle-[)late, and of ii fronlal ascending portion; free oa-cia, 

 freely movable avicularia) Diiuorpliozoiim n. g. 



1) If the colony consists of two layers, the zocecia of the two layers 

 are of the same kind: 



2) Zooecia without operculum; (the edge of the dislal wall is angu- 

 lar; within this a row of single-pored roselte-plales; free Od'cia, freely 

 movable, cai)itate avicularia, radical fdnes issue both from Ihc fVoiilal, 



basal and lateral aspects of Ihe colony) limjiiln Okcn (Lev. mod). 



2) zocecia wilh an operculum: 



' 111, p. 14. 



