300 HlSTOllY OF BRITISH ZOOPHYTES. 



sand strongly united together^ and in the microscope it 

 looks like a pumice-stone. It forms a porous, friable, cal- 

 careous mass. It is very seldom an inch in length, but 

 very common in small patches, sometimes pink or purple, 

 but generally on the Ayrshire coast dirty-white. When in 

 good state the aperture has a tooth above, and sometimes a 

 small one on each side. It is one of the least interesting 

 of our coriillines. 



2. Cellipoka eamulosa, Pallas. (Plate XYII. fig. 61.) 



Hab. In deep water, attached to old shells. 



This, though considered by some as a variety of the latter, 

 cannot fail to attract attention, for it is like some of our 

 foreign corals in miniature, rising in a branching form to the 

 height of two or three inches, so that even our fishermen 

 deign at times to preserve it as a pretty curiosity ; though, 

 being brittle, it is very apt to be broken in their hands. 

 The branches are very rough with toothed cells. 



8. Cellipora Skenii, Dr. David Skene. 



Hab. On shells and corallines, deep water. Aberdeen, 

 Skene; Zetland, rare, Dr. Fleming; coast of Northumber- 

 land and Berwickshire, not rare ; on Pinnce, off the Dead- 

 man, Couch ; eastern coast of Ireland, Miss Ball. 



It is from half an inch to an inch in height, much com- 



