124 



separated into genera and which accordingly must provisionally be characterized 

 mainly in a negative way, I shall pro[)ose for these the name Heterofluslva, and 

 the introduction of such a provisional name seems to me necessary in ail simi- 

 lar cases. 



Synopsis of the genera. 



1) The side-walls with multiporous rosette-plates; if orecia are pre- 

 sent, they are egg-shaped, the distal wall forming at the same time a 

 distal and a proximal cup-shaped arch; 



2) the larv?e are ejected through a chitinous tube, which opens 

 distally to the zooccial operculum, and may be covered by a movable, 

 calcareous valve; avicularia of the same size as the zorecia, lyriform; 



the operculum with two large wing-shaped lateral expansions. . . Sarsifliisird .lull.' 

 '^^'"^''''^ (S. abyssicola Sars). 



2) No such apparatus for the ejection of the larvae; egg-sha])ed 

 ocEcia may occur and smaller avicularia, the operculum of which has 



no lateral expansions Fhistra (L.) Lev. 



(Fl. foliacea, L. 

 - carbasea, Ellis and Sol.) 

 1) The side-walls have uni[)orous rosette-plates; if ocrcia are pre- 

 sent, they are cup- or cap-shaped, the distal-wall only forming a single 

 arch : 



3) The oojcia immersed into the bottom of kenozooecia (no avicularia, 



colony with two-rowed branches) Kenella n. g. 



(K. biseriala Husk.) 



3) The oa?cia immersed in ordinary zooecia or in avicularia (the 

 colonies with several rows). 



4) The distal wall, at any rate in the onecia-bearing zoa'cia, very 

 often also in the ordinary zocecia, meets with the basal wall in an 

 angularly bent or curved line; the free edge of the onecia on the frontal 

 side of the colony lies much lower than the basal edge; the avicularia 

 have the same size as the zooecia, (the colonies much branched dichoto- 

 mously, with frequcntlj' the branches meeting and thus forming an open 

 network; radical fibres occur in the angles of the branches).... Relifliistra n. g. 



4) The distal wall horizontal or very slightly curved; the free, 



' 4(i, p. 4;i 



