96 BICELLARIID^. 



of fibrils or rootlets, by means of which it adheres firmly 

 to the shell or weed over which the polyzoon creeps. 

 After the disappearance of the radical fibre itself, its 

 point of origin is marked by a small tubular projection 

 on the surface of the cell. In Diachoris, I find, attach- 

 ment is effected in precisely the same way. 



The zoarium, then, in the genus Beania, is composed 

 of a number of pedicellate cells, which spring one from 

 the other in linear series, from which other lines are 

 given off at right angles. The secondary series originate 

 at opposite points on the sides of the cell, near its base. 

 The whole structure is generally decumbent, and in this 

 condition is attached by radical fibres emitted from the 

 individual cells. 



A Patagonian species, Beania australis^ Busk, is said 

 to form a connected frond at times, and in this state 

 must approach very closely to Diachoris. 



Three species have been described besides our own B. 

 mirabilis : — B. Swainsoni, Hutton, an erect phytoid form 

 from New Zealand (apparently taking on to some extent the 

 habit of Bugula) ; B. admiranda, Packard, from Labrador ; 

 and the Patagonian form just referred to. 



Beania mirabilis, Johnston. 



Plate IV. figs. 8-10. 



Beania mikabilis, Johnst. Aim. N. H. ser. 1, v. 272; B. Z. ed. 2, 372, woodc. 

 figs. 69, 70 : Busk, B.M. Cat. i. 32, pi. xxiv. figs. 4, 5 : 

 Hincks, Ann. N. H. ser. 2, xv. 129: Landsb. Pop. Hist. 

 B. Z. 369, pi. xix. fig. 25 : Smitt, (Efv. 1867, no. b, 292 

 & 357 : Heller, Bryoz. Ad. M. 13. 



Zoarium adherent by means of radical fibres given off 

 from each cell. Zocecia subcalcareous, boat-shaped, con- 

 tracted above and bulging below; two denticles above 



