66 



BICELLARIID^. 



ig 



Fig. 4, 



erect. The zooecia are essentially identical in character ; 



and such a species as D. spinigera, Mac- 



Gillivray (woodcut, fig. 3), in a younj 



state, when the cells are ranged in a single 



line, is hardly distinguishable from a 



Beania (woodcut, fig. 4). 



Throughout this family the cells are 

 loosely connected ; in Bicellaria, though 

 placed side by side, they are often really 

 disjunct. 



In some of the BuguliE (e. g. B. Mur- 

 rayana) the branches are composed oi a^ 

 many rows of cells, and assume a some- 

 what Flustrine appearance; whilst such B,,,,,iamirai,Uis. 

 forms as Bicellaria Alderi remind us of 

 the CellulariidcB. 



Genus BICELLARIA, Blainville. 



Der. From bis, twice, and cella, a cell. 



Bicellaria, Blainville, Diet. Se. Nat. 1830 : Gray : Bask, &c. 

 Cellularia, Pallas (part.) : Fleming : Johnston : D'Orbigny. 

 Cellaria (part.). Ell. & Sol. : Lamk. 

 Okisia (part.), Lamouroux : Van Beneden. 



Generic Character. — Zoarium erect, phytoid. Zocecia 

 turbinate, or in the form of a cornucopia, loosely united, more 

 or less free above ; aperture looking more or less upward, 

 directed obliquely inwards below ; inferior portion of the 

 cells subtubular, usually much produced. Avicularia, when 

 present, jointed and capitate^. No vibr acuta. 



In Bicellaria the zoarium does not present the variety 

 of structures which we have in Menipea or Scrujwcellaria ; 



An exception is presented by the Australian B. tuba, which possesses 

 a fixed avicularium, borne at the top of a tall spinous process. 



