82 Mr. T. Davidson on Waldheimia venosa. 
clay underlies the sand, in which anchors hold very firmly. 
Many small Serpule are attached to its surface; and a long piece 
of sea-weed, two feet in length, was found growing from near 
its hinge. 
On opening the box containing this interesting specimen (of 
which two correct drawings are here appended), I at once per- 
ceived that the shell was no other than an extremely large ex- 
Waldheimia venosa, Solander, sp. 
(Falkland Islands, and Collection of Rear-Admiral B. J. Sulivan.) 
