100 



this family. Brcllui liibcvformis seems according lo Hi neks' figure lo liave an 

 angularlj' bent dislal wall and would therefore, according lo the above given 

 synopsis, have to he referred to Genwllaria. Regarding Syniwtiini aviculure I have 

 no information about the structure of the distal wall, and if this, as in Gemellaria 

 loricdta. is angular, there might be some ground, in spite of the presence of avi- 

 cularia, to refer il to the genus Gemellaria. A closer examination of those mem- 

 bers of the family, which Busk has described in the Challenger Expedition's 

 Bryozoa will no doubt lead to the setting up of several new genera, and Busk 

 explains also that to avoid doing so he made his definition of the genus Biigiila 

 very elastic, whilst at the same lime dividing the species into four groups. 



It will for these species be of j)rincii)al interest to lind out whether they have 

 an operculum or not, and also how their distal wall and ooecia are constructed, 

 hi Biujiila iniiabilis and '•Biigiila<' leontodon, of which two species I have been 

 able to examine a small fragment without ocrcia, there is an operculum as well 

 as an angular distal wall, and these together with two other species are referred 

 to Busk's first group, where the ooecia which only a])j)ear in the median row 

 of the colony, are enclosed in the proximal part of the higher placed zocrcium. 

 The question is therefore, whether these si)ecies form a new genus or whether 

 they can be included under Diclymia, the ooecia of which however are surrounded 

 by kenozoci'cia. In Biigiila bicornis the higher j)laced zorrcium arises far back on 

 the basal side of the lower and meets with this in a circular disk. The form, 

 which Busk mentions under the name of Diachoris nuHjellanica, v. distans. but 

 which he has not made the subject of any description, seems, to judge from Ihe 

 figure given, not only to be a separate species, but also to represent a new genus. 

 The whole frontal wall seems namely to be calcified except for a median longi- 

 tudinal slit, which proximally is much widened, and in front is continued right 

 to the aperture, which is provided with a sinus. 



Bugula Oken, char, emend. 



The zo(vdiiiu without an operculum. Distal wail with a basal angular edge 

 within which there is row of uniporous rosette-plates. Freely movable capitate 

 avicularia; free (xvcia. The colonies free, branched, the zooecia in two or more 

 rows. 



Waters as is known has shown, that an operculum is wanting in Biujula, 

 and Calvet has confirmed this observation lor Ihe French species. Whilst I am 

 certain that an operculum is absent in Ihe other /J(/.(/H/«-species, which are found 

 in our Zoological Museum, I am not (luile so sure of this for B. calicnlala, be- 



