THE CROCK. 281 



Locality. 



Deep water, off Isle of Mau, on nullipore beds : deep water, four leagues 

 west of Falmouth, on a valve 'of Pecten maximus. 



The late E. Forbes first obtained this interesting form 

 in August, 1840, and assigned to it its generic and specific 

 names ; the former from tcairvr], 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 coloured drawing made from the living animal, 

 which I have copied in my Plate IX. 



Phellia. 

 SANGUINEA. 



Aureliania. 



