756 Proceedings of Royal Society of Edinburgh. [sess. 
This medusa is liberated from the hydroid Podocoryne carnea , 
which has not yet been recorded for the Clyde. As all the 
medusae belonged to very early stages, the hydroid is likely to 
be found there. 
Sarsia eximia, Allman, 1859. 
Sarsia eximia , Allman, 1872, p. 282, pi. v. 
On 17th September 1902, I found a colony of Syncoryne eximia 
attached to the wooden piles of Keppel pier. This colony was 
about 30 mm. in height and had a bush-like appearance, with the 
stems irregularly branched. As medusa-buds were present upon 
the hydranths, the colony was placed in a bell-jar in which was 
working my plunger apparatus. It soon began liberating medusae, 
and the supply was so plentiful that I had occasionally to preserve 
a few dozen young medusae to prevent overcrowding. The bell- 
jar was kept well supplied with copepods, upon which the hydroid 
and its medusae fed and flourished. 
The colony was suspended by a thread in the bell-jar, and some 
of its branches just touched the side of the glass. At first it made 
very little growth, and it was not until gemmation ceased that 
growth really began, then it proceeded at a rapid rate. The 
branches which touched the glass attached themselves to the glass 
and became stolons. These stolons grew very quickly and ran 
almost straight along the surface of the glass. From the main 
stolons numerous lateral stolons grew out, usually at right angles, 
and upon them the hydranths developed. The hydranths when 
first formed were usually sessile, but soon a stem was developed. 
Later on, hydranths began to appear upon the sides of the stems. 
At first these were sessile, but soon a stem developed, and thus 
the original stem became branched. The branching of the stems 
was only a small part in the growth of the colony, as the branches 
were short and few in number. The great growdh of the colony 
was by means of stolons bearing isolated and single hydranths 
upon short stems. A change of habitat produced a change in the 
form of the colony. The original colony was like a little bush, 
whereas the new growth in the bell-jar was distinctly a creeping 
form of growth. This shows that it is not safe to base specific 
characters upon the exact shape and form of a colony. 
