99 



lower zooecium; two successive zooecia separated by a small uncalci- 

 fied space; the distal wall has an uncalcified multiporous rosette-plate; 

 the radical fibres which arise from the boundary between two zooecia 

 at their rim, run proximally and join, filling the spaces between the 

 branches in the proximal part of the funnel-shaped colony) . . . Kinetoskias Koren- 



Danielsen. 



16) No such muscle; no uncalcified space between the zooecia: 



17) Each zooecium consists of three sections separated by constric- 

 tions, of which the middle one is elongated, cylindrical, while the distal 

 one is obliquely funnel-shaped (avicularia freely movable; the basal 

 edge of the distal wall unequally asymmetrically angular; the radical 



fibres issue from the basal side of the zooecium Bicellaria Blainville (mod.). 



17) The zooecia not divided into three segments separated by con- 

 strictions: 



18) The basal edge of the distal wall is angular: 



19) Distal wall with two multiporous rosette-plates; sessile avicu- 

 laria Bugularia n. g. 



19) Distal wall with small uniporous rosette-plates; free avicularia; 

 (zooecia widening from a narrow cylindrical proximal part into an 

 obliquely funnel-shaped extremity; radical fibres issue from the lateral 

 margins of the zooecia) Bicellarina n. g. 



(B. Alderi Busk). 

 18) The basal edge of the distal wall not angular: 



20) Distal wall very slightly ascending, with several uniporous 

 rosette-plates; no avicularia; radical fibres issue everywhere from the 

 covering membrane of the frontal surface in the two-layered colony. . Watersia n. g. 



20) Distal wall consisting of a basal, horizontal part with a multi- 

 porous rosette-plate, and a frontal strongly ascending part; freely movable 

 avicularia; radical fibres issue from the second (more seldom also from 

 the first) rosette-plate of the marginal zooecia Dendrobeania n. g. 



In the above synopsis of the genera, in which the degree of relationship is 

 not expressed by their consecutive order, 1 have not been able to take account 

 of a series of earlier described forms, which I do not know from personal obser- 

 vation. So far as Huxleya is concerned, this genus is said to have a completely 

 calcified, arched frontal surface, and does_ not seem to belong in any way to 



