THE WALLED COBKLET. 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 disturbing 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 $e\Xo5, the cork-tree, and also its 

 bark. The specific appellation indicates the chief 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 



