914 WRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
tine behind the typhlosolar portion resembles that described 
as present in the right division of the straight intestine. 
The wall may be smooth or thrown into three or four 
longitudinal ridges. The whole surface is ciliated. The 
oily eosinophilous globules already referred to are particu- 
larly abundant in the coiled intestine, and many may be 
found lying freely in the cavity. The average diameter of 
this portion of the intestine is about 0°5 mm. 
Towards the anus the epithelium becomes arranged in 
a very peculiar manner (fig. 14, Pl. III.). Passing over the 
posterior adductor the wall becomes thrown into longi- 
tudinal folds, which, towards the anus, become more 
complex, secondary foldings being developed, and the 
bases being narrowed till some folds have, in transverse 
section, an almost dendritic appearance. Within they are 
filled up by the dense tissue already noted. A continuous 
sheet of connective tissue with a few muscle fibres 
surrounds the gut, but does not enter into the folds. 
Near the anus this dense filling tissue becomes restricted 
to the dorsal half of the intestinal tube, where it forms a 
crescentic pad lying on the epithelium beneath. This 
epithelium differs completely from that forming the 
ventral half. While the latter is thrown into complex 
foldings and bears long cilia which, on account of the 
proximity of the folds to each other, become matted 
together in the lumen, the upper epithelium is smooth, 
is non-ciliated, and consists of long clear spindle cells, 
with nuclei lying at their lower extremities, which form 
a sharp contrast with the cubical epithelium of the lower 
half. The transition from upper to lower epithelium is 
quite a sharp one. The tissue forming the pad lying on 
the upper half of the tube differs somewhat from the 
dense tissue lying outside the intestinal tube in its more 
anterior parts. Here it seems to consist of a dense mass 
