There were two helices all right, as an explanation of how Pheola could be right and then wrong.
Of all Australian Helices, this is perhaps the most curious.
On trying to obtain the shock from these helices, I could not succeed at first.
The capital thus shows its true profile, the helices upon front and back, and upon the subordinate sides rolls of their thickness.
I observed on the beach at this spot some small species of unios, and, at higher points on the shore, helices.
The other four helices were similarly arranged, but their ends connected with a Leyden jar.
When the iron cylinder was replaced by an equal cylinder of copper, no effect beyond that of the helices alone was produced.
Other electro-magnets could be made at pleasure by introducing a soft iron rod into any of the helices described (1053, &c.).
The widow does not remove the ornaments worn in the helices of the ears, and in the alæ and septum of the nose.
With all this diversity the land shells or helices may always be distinguished from their salt or fresh-water relatives.