THE GLAUCOUS TIMPLET. 
197 
closely like those of the Gem. Like the latter, it expands 
under the stimulus of the light, rather than in darkness, 
indicating a habitually exposed mode of life. Like gem- 
viacea, it frequently erects itself when closed, in the form 
of a pillar ; and throws off successive rings of mucus from 
its body, which accumulate around its base, if not removed. 
The action of the waves would wash these away in a state 
of freedom ; in a tank tliey should be detached by means 
of a stick or hair-pencil. 
I have never seen the warts of gemmacea used as suckers ; 
but in specimens of the present species, I observed this 
function exercised by them very signally ; not in the way 
of attaching extraneous fragments to the body, like S. hellis 
and T. crassicornis, but in taking hold of a firm support, 
like S. troglodytes. Tlie suckers of the column adhered 
with force to the side of the glass vessel, and by contrac- 
tion were stretched as above described. 
The specific name “ ” (not TJialia, as M. Milne 
Edwards misquotes it) I adopted in allusion to the elon- 
gated form and glaucous colour, from daWla, an olive- 
shoot. The same idea recurs in the epithets which distin- 
guish the varieties, — as if the glaucous, the dull brown, and 
the chocolate, were the twig as green, dry, and scorched. 
It is possible that the immature snecimens, found by 
Templeton in Belfast Lough, and named by him Act. 
monile,^ were the young'of this species ; though they have 
been generally attributed to gemmacea. 
gemmacea. 
TIIALLIA. 
[xanthogrammica]. 
[Artemisia]. 
T. crassicornis'. 
* Loudon’s Mag. N. H. ix. 303 ; fig. 49. 
