104 REroRT — 1884. 



fragments of species being minute, the characters have to be made out 

 very cautiously. 



Genus Caberea, Lamouronx. 



= Cellaria sp., Lamk. ; Fhisfra sp., Flem., Johnst. ; Selbia, Gray; 

 Flabellaria, Gray ; Canda sp., D'Orb. 



1 Zoarium not articulated. Zoceeia in two or more series, sub- 

 quadrangular or ovate, with a very large aperture. Sessile avicularia on 

 the side and front of the cells, the lateral avicularium minute. Vibra- 

 cular cells very large, placed in two rows, stretching obliquely downwards 

 across the back of the Zoceeia, which they almost cover, to the median 

 line, notched above and traversed through a great portion of their length 

 by a shallow groove. Seta? usually toothed on one side.' — Hincks, 

 ' Mar. Polyz.' p. 57. 



Fossil Caberea are, like the Scrupocellaria previously described, also 

 difficult of specific identification ; but the genera being so cosmopolitan, it 

 would be surprising indeed if fragments were not distinguishable. The 

 size of the vibracula is one of the peculiar features of Caberea, and the 

 many characters of the genus given by Mr. Hincks ought to make the 

 study of species peculiarly attractive. But much of our knowledge 

 concerning fossil forms is furnished by Mr. A. W. Waters in his series of 

 Papers on Australian Bryozoa. Even he, however, has had to depend in 

 one instance on a single row of cells, while in others the ' opercula,' and 

 the large erect avicularium have helped in the determination of specific 

 forms. 



16. Caberea Ellisti, Fleming ( Hincks, p. 59.) = Flustra ibid., 



Flem. ; F. cefacea, Flem., Johnst.; Cellularia Hookeri, part, 

 Johnst. ; Bicellaria Hooheri. Blainv. ; Caberea Hookeri, Busk, 

 Gosse ; Flabellaria setacea, Gray. Glacial and Palaeolithic. 



17. Caberea Boryi, Audouin, Waters = Crista Boryi, Aud. = Selbia 



zelanica, Caberea ibid., Gray, Busk ; Caberea Boryi = C. 

 patagonica, Busk=Canda Boryi, D'Orb, ' Pal.' ; Glacial, British ; 

 Miocene, Australia. 



18. Caberea rudis (?), Busk. Glacial, British; Australia, Miocene. 



Waters, ' Quart. Jour. Geol. Soc' vol. xxxvii., vol. xxxviii. 



19. Caberea graxdis, Hincks. Glacial, British; Australia, Miocene. 



Waters. 



20. Caberea lata, Busk. Australia, Tert. Poly. Etheridge, jun., 



' Synopsis.' 



Family IV. Biceblarupje, Busk, Smitt. 



Genus Bicellaria, Blainville. 



In his remarks on the family Bicellariids Mr. Hincks says: 'The 

 zoarium assumes two very different and strongly contrasted conditions 

 within the limits of this family ; and it is only after carefully examining 

 the entire series of forms included in it that we recognise the close 

 affinity of such divergent genera as Bicellaria and Bugula. The two are 

 connected and linked together by the genus Bugula and the genus 

 Biachoris, of which latter we have no representatives on our coast.' — 

 1 Brit. Mar. Pol.' 64. We have no fossil Bicellaria, and only one, I believe, 

 of Bugula. 



