BRITISH ZOOPHYTES, 295 



Hab. : Generally distributed. Blackpool, Menai Str., 

 Seascale, Jersey {A. 8. P.). 



This is the *' Tufted Ivory Coralline " of Ellis, and is 

 very easily distinguishable by its whiteness and brittle- 

 ness. The zooecia are alternate and arranged in inter- 

 nodes of 3 — 9, or 11 (rarely moi-e than 7) cells. The 

 cells are speckled, and form very pretty objects under 

 the lens. This zoarium is often much branched, the 

 branches usually arising from one of the lowest (usually 

 the lowest) cells in an internode. The ovicels are 

 pyriform and densely punctured. Arising from the 

 zooecia are occasionally long tubular extensions which 

 appear to serve the purpose of radical tubes, and to 

 act as modes of attachment. The zoophyte grows to 

 a height of j to 1 inch, and is generally found parasitic 

 on other zoophytes, particularly H. falcata and F. 

 foUacea. 



3. C. DENTicuLATA, LamarcJc. 



Cellaria denticulata {LamJc.), Crisia luxata {Flem., 

 De BL, B. Q. G., O.J.). 



Hab. : Generally distributed. 



This has been called the "" Black-jointed Coralline.''^ 

 — Couch. It differs from the preceding by its erect 

 and stiff mode of growth and straight branches, by the 

 length of the internodes, and by the jet-black joints 

 at the nodes. The internodes usually contain 11 — 16 

 cells, which are adnate throughout almost their entire 

 length, and are speckled. The ooecia are oval and 

 speckled. 



Favourite habitats for this species are the roots of 

 Laminaria, upon which it grows to the height of an 

 inch or more. 



The branches generally arise from about the centre 



