THE CROCK. 
281 
Locality. 
Deep water, ofiF Isle of Man, on nullipore beds ; deep water, four leagues 
west of Falmouth, on a valve of Pecten mcucimus. 
The late E. Forbes first obtained this interesting form 
in August, 1840, and assigned to it its generic and specific 
names ; the former from Kdirvrj, a chimney, from its re- 
semblance to a chimney-crock, of which suggestion I have 
availed myself to make an English appellation. He tells 
us little of its history beyond what I have embodied above ; 
except that it is an active creature, changing its form often, 
but always presenting more or less of a tubular shape ; and 
that the upper part of the body can be retracted within the 
column as low as the commencement of the epidermis. 
Mr. W. P. Cocks has since obtained a second specimen. 
This was considerably smaller than Forbes’s, but agreed 
with it in essential points. Mr. Cocks has kindly put into 
my possession some notes of his specimen, which have 
enabled me to add a few details to Forbes’s diagnosis ; and 
also a colom’ed drawing made from the living animal, 
which I have copied in my Plate IX. 
Phellia. 
SANGUINEA. 
Aureliania. 
