VALKERIA. se ig fl 
A good description of this interesting and beautiful zoo- 
phyte is given by Professor Fleming, by whom the genus 
was named in honour of the late Dr. Walker, Professor of 
Natural History in the University of Edinburgh. The 
stems usually arise from the base, filiform, jointed, and sup- 
port the branches and cells bifariously: the cells are oval 
and large; often they occur in whorls in the axille of the 
branches ; the polypi extend beyond the margin; tentacula 
with hairs, which, by their motions, cause the water to 
ascend in a current on one side and descend on the other, 
acting, as is supposed, as aerating organs.” This is got in 
great beauty, and at times in considerable abundance, on 
the coast of Ayrshire. Dr. Fleming states that it is seldom 
above two inches in height, but on Halidrys siliquosa we 
have occasionally seen it four inches. Halidrys is its fa- 
vourite ; but it is often found on Rhodymenia bifida, though 
of smaller size than when on Halidrys. It is of a pale 
yellowish colour, and makes a handsome specimen on paper, 
to which it firmly adheres. I find that it is phosphorescent 
when shaken in the dark. 
2. Vatxeria vva, Grape Coralline, dis. 
Hab. Leith, Jameson; county Down, Templeton; Couch, 
Cornwall; Dublin Bay, Hassall. ; 
