THE WALLED COEKLET. 
137 
It has "been my custom, — and I recommend the plan to 
brother and sister naturalists, — not to satisfy myself with 
such creatures as I see on the spot, but to take specimens 
of the rock at random for examination at home. I look 
out for the dirtiest, roughest, most corroded parts of the 
rock, at the lowest level that I can reach, and with the 
chisel cut off small fragments. These I bring home, 
and spread out, face upward, in shallow pans of clean sea- 
water. After a few hours, say perhaps the following 
morning, I carefully search with my eye, aided at intervals 
by a lens, but without distui'bing the water, the surfaces of 
the bits of rock, as well as the sides of the vessel ; and 
thus I have obtained more than one new species, which 
I might never have known otherwise. 
For the actual discovery of the present species, I am 
indebted to my little son, whose keen and well-practised 
eye detected the tiny atom, as a form with which he was 
unacquainted, on one of the fragments I had brought home. 
Presently afterwards I discerned another specimen; and 
these two are the only examples that have as yet come 
under my notice. 
The rough corky appearance of the epidermis in this 
and the following species, suggested the generic name, 
which is formed from 0e\Ao9, the cork-tree, and also its 
bark. The specific appellation indicates the ehief distinc- 
tion between this and the following species, the edge of the 
epidermis encircling the summit of the animal when con- 
tracted, as if with a wall. The force of the English 
appellation is obvious.* 
* I feel that I am arrived at a point where I need the kind consideration 
of my readers. Popular as the cultivation of Zoophytes has become, there 
are still many who prefer to call them by English names, the ladies in 
particular. It is a natural and proper desire, and I wish to respond to it. 
But no vernacular terms exist, by which the hitherto recondite subjects of 
this work are known. What shall I do in this case ? Shall I use the term 
