98 



10) The basal edge of the distal wall not angular; long-stalked 



fixed avicularia; no constriction distally to the distal wall... Epistomia Fleming. 



9) The zooecium not divided into a proximal, narrow cylindrical 

 and a distal wider part (no avicularia). 



11) The basal edge of the distal wall angular; (radical fibres issue 



from the lateral margin in the proximal part of the zooecium . . . Gemellaria Savigny. 



11) The basal edge of the distal wall not angular Brettia Dyster. 



8) Ooecia present: 



12) The ooecia, which do not issue from the boundary between two 

 zocecia placed in the same longitudinal row, are covered by kenozooe- 

 cia; (the proximal part of the zooecium separated from the distal by 

 a more or less distinct constriction a little distally to the distal wall). 



13) The ooecia are placed on zocecia of ordinary size; zooecia very 

 asymmetrical, from the narrow tube-like proximal part widening into 

 an obliquely funnel-shaped extremity, furnished with spines; as a rule 

 there are found avicularia, the radical fibres, which go down along 

 the basal surface of the colony, issue from a rosette-plate a good way 



distally on the basal aspect of the zooecia Cornucopina n. g. 



13) The ooecia are placed on zooecia of smaller size; zocecia sym- 

 metrical or only a little asymmetrical; no spines; no avicularia. 



14) The basal edge of the distal wall angular; the ooecia-bearing 

 zooecia placed between two zooecia in a bifurcation; (the frontal wall 

 of the kenozooecium membranous, furnished proximally with two 

 calcareous processes; (no rosette-plate between two neighbouring 



zooecia Didymia Busk. 



14) the basal edge of the distal wall not angular; the ooecia- 

 bearing zooecia attached either proximally to the frontal area or to 

 the basal surface of other zocecia; the frontal wall of the kenozooecium 

 calcified Eucratea Lamouroux. 



12) Free ooecia issue from the boundary between two zocecia placed 

 in the same longitudinal row: 



15) The distal wall furnished with four uniporous rosette-plates, 

 each of which is placed at the bottom of a separate chamber; (no 

 avicularia) Dimetopia Busk. 



15) The distal wall not formed in this way: 



16) Each zooecium has a strong muscle, which at its distal end is 

 attached to the inner side of the external wall of the zooecium, and 

 at the other to a conical projection from the distal wall of the next 



