JOTTINGS—AMPHIDOTUS CORDATUS, PENN. 338 
the first three joints of the first pair of legs, Change of colour in 
this species is the more remarkable in that it is seldom seen 
bearing parti-colours or adventitious matter of any kind. This 
may arise from the young at least being mostly under stones, and 
requiring no further protective device to elude their enemies. 
On Amphidotus cordatus, Penn. 
[Read 30th June, 1896.*] 
TuIs species is plentiful on all our sandy shores, burrowing in the 
sand to the depth of four or five inches, and communicating with 
the surface through a small opening about the diameter of a black- 
lead pencil. This hole is a good guide to where they lie. They 
are constant burrowers in the sand on the tidal belt, from half- 
tide to some distance below low water, but oceasionally I bring 
the young up in the dredge from deeper water. 
Captain Turbyne informs me that in Loch Striven, in a depth 
of ten to twelve fathoms, a large quantity of them came up in the 
trawl, none of them larger than an ordinary gooseberry. There 
can be no doubt that in both cases they were taken on the surface 
of the bottom. Im searching for them at low water, it is a rare 
occurrence to find one of the young, which leads me to suspect 
that they do not burrow in their early stages. 
Although TI have not found adult live animals in deep water, it 
is quite likely that they may be there, as the young are, although 
the dredge may not reach them. The following circumstance gives 
some confirmation to the idea that this may bethecase. Last winter, 
after a storm, a large number were thrown up on the sandy beach 
at Kames Bay, Millport. There would have been little difficulty 
in gathering a bushel of them. They were all without the spines, 
and empty, showing that they had been dead for some time, and 
most likely on the surface of the sand, as they were nearly all well 
bleached. Finding so many of their dead tests on the surface of 
* Vide Trans., Vol. I. (N.S.), pp. 290-293. 
