210 
the living polypide. Again it may be considerably longer than the zo- 
oecium and it is then found coiled up, sometimes making a heavy loop 
over the main parieto-vaginal muscle band, or curling under or behind 
the polypide. The cylindrical body is usually, but not always paired, 
the size and length being often totally unequal on the two sides. There 
is no communication between the two and if. there is interzooecial 
communication between the long bodies of neighbouring zooecia it is: 
only by means of the tissues in which the spherical heads lie imbedded. 
In the living state the bulk of this body is not of such a bright 
colour as the polypide, but it is dotted over with flecks of exceedingly 
Fig. 2. 
BEN (NX 
DSS 
\R 
LS RS 
WA | De 
bright, transparent orange colour. When dissected out in the living 
state it may be seen to consist of a mass of threads which show no 
movement and take no stain. 
In preparations fixed with Flemming’s fluid and stained with 
Heidenhain’s iron haematoxylin the body is seen to consist of a 
cellular membrane in the form of a sheath in which the «threads» are 
closely packed, and within which lies a straight series of non-staining 
circular patches, seemingly empty; it is this row of non-staining flecks 
that show the very bright yellow colour in the living animal. 
