99 



lower zo(Pciuni; two successive zofccia separaled by a small iiiicalci- 

 fied space; the distal wall has an uncalcified multiporoiis losette-plale; 

 the radical fibres which arise from the hoiiiidary between two zo(L'cia 

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

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



Danielsen. 



16) No such muscle; no uncilcified space between the zoa3cia: 



17) Each zoircium 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 zofrcium BicclUuin Hlainville (mod.). 



17) The zooecia not divided into three segiuents 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 Biiyiilaria n. g. 



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

 (zooecia widening from a narrow cylindrical [)ro\imal [)arl into an 

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

 margins of the zoa^cia) 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 . . Wdlcrsid n. g. 



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

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

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

 the first) rosetle-i)lalc of the marginal zocecia DendrobcanUt n. g. 



In the al)ove 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 |)ersoual obser- 

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

 calcified, arclied frontal surface, and does no! seem to belong in any way to 



