ON PUSTULOPORA CLAVATA OF BUSK. 89 
November, 1870, when he was kind enough to examine, with me, 
the specimens, and he came to the same conclusion as that which 
I had arrived at; and now, considering that your Institution has 
the prior claim, I have very great pleasure in sending you the 
first notice of the decision, for your forthcoming Meeting. 
Pustulopora clavata may be thus described :—Polyzoarium 
ramose, branches cylindrical, with tubular cells springing from all 
sides of the stems, surface entire and not annulated, tips dilated 
and truncate, the open ends of the clustered tubes filling all the 
top, but not rising above it, as they do in Pustulopora ventricosa, as 
may be seen in the accompanying sketch, fig. C. and at D. where 
the tip is much more enlarged. It was attached to, and nestled 
amongst, other zoophytes ; one piece was partly covered by the 
sponge, Halichondria panicea, all its companions being well-known 
British forms. 
The other figures on the plate are intended for the notice of - 
Eschara verrucosa, published in Vol. x, p. 116, of your Journal. 
Fig. 1. Natural size. 
2. Transverse section of lower end of stem, magnified. 
3. Cells on older portion of stem, much enlarged. 
4, A vibraculum do., do. 
5. Young cells from the upper part of a branch do., do. 
30, Haddington Place, Edinburgh, 
10th May, 1871. 
