212 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
wall into the cavity, or even free in the cavity of the 
intestine itself. Many of these are possibly migrating 
cells taking up food matters and again passing back 
through the intestine into the blood stream, but there can 
be little doubt that many are the products of secretion 
of cells in the intestinal wall itself or in the tissue lying 
round that wall. Masses of a dense tissue staining with 
haematoxylin in the same manner as the mucus-secreting 
cells in the foot and mantle are to be found along the 
whole length of the intestine. 
The feecal matter is expelled from the intestine in the 
form of coherent strings, frequently of great length, in 
which the particles are certainly bound together by some 
viscous material. On Barrois’ view this fecal matter 
ought to contain a substance chemically identical with the 
substance of the style, otherwise, transformation of the 
latter goes on in the intestine, and the substance of the 
style must function otherwise than as a simple lubricant. 
On the whole it would seem as if the presence of the style 
were associated with the ingestion of a large quantity of 
foreign matter, such as mud and sand, and the separation, 
to some extent, of the nutrient material therefrom. The 
substance of the style need not be regarded as physiolo- 
gically a store of reserve material, but as a first separation 
out of some constituents of the food which are continuously . 
lodged in a portion of the stomach by the action of the 
ciliated wall of the latter, and as continuously dissolved 
away. 
A narrow slit on the anterior surface of the straight 
portion of the gut leads into the next division—the spiral 
portion of the intestine. This lies nearly in the axis of 
the proxunal limb of the viscero-pedal mass, and anterior 
to the latter. It is twisted into a close spiral of five or six 
turns (Al.c.4, figs. 3 and 11) the planes of which are 
