372 HISTORY OF BRITISH ZOOPHYTES. 
Ellis found this little coralline creeping on the surface of 
Flustra foliacea, each of the vesicles having a black spot, 
like the spawn of frogs, or rather like grapes with the 
seeds in them. When seen through the microscope, he 
saw that these grape-like bodies were clusters of very lively 
polypes, extending their tentacula in pursuit of prey. What 
he had seen as dark spots were the dead polypes in their cells. 
3. VALKERIA PusTULOSA, Pimpled Coralline, H//is ; Dicho- 
tomous Tubular Coralline. 
Hab. Isle of Wight, Ellis; Salcombe, Rev. T. Hincks ; 
Cove Harbour, J. V. Thompson; Youghal, Miss Ball; 
Belfast Bay, W. Thompson; Dublin Bay, A. H. Hassall ; 
Cornwall, rare, Mr. Peach; Leith shore, rare, D. L., junior. 
It appears through the microscope full of pustules, with 
a speck in the middle of each. It is two or three inches 
in height. The branches are perforated by a double row of 
holes, in which there are polypes with eight tentacula. 
Genus XXVIT. BOWERBANKIA, Farve. 
Gen. Char. Polypidom confervoid, matted or irregularly 
branched ; the cells sessile, unilateral, irregular, the inflected 
portion with a spinous or filamented rim. Polypes ascidian, 
with a strong gizzard. 
