212 Henry Lesiiz OSBORN, 
structure. A somewhat similar appearance is indicated by NICKERSON 
for the muscle of Stichocotyle, and by Svarrorp for that of Aspidogaster, 
but the fibres are not swollen at the stained places, as in STAFFORD’S 
fig. 26. 
g) The Parenchyma. 
This tissue presents the appearance usual in trematodes. In 
the meshes of the branching fibres there are gland: cells most 
numerous in the neck region, but found in all parts of the body. 
They are flask shaped (Fig. 15) and measure 20 « at the base, 
they penetrate the cuticle and open to the exterior. The cell 
contains a finely granular material with no affinity for haematoxylin 
and staining faintly with orange G. There is a distinet nucleus, 
which is located on the margin of the cell in the deeper portion 
(Fig. 16). It is not compressed there as in many gland cells. In 
some instances fibers of the parenchyma muscles are in such relation 
with these cells as to suggest that they may, by contraction, discharge 
them. 
h) The Alimentary System. 
This is not essentially different from that of the rest of the 
members of the family. The mouth, only slightly in front of the 
pharynx, projects into the mouth-funnel at its base. It is very 
distensible and is controlled by circular and dilator fibers (Fig. 17). 
There is a slight indication of a pre-pharynx. The pharynx has a 
flattened egg shape, its vertical diameter slightly exceeding the 
transverse. It is lined with a continuation of the outer cuticle, 
and composed of muscular fibers bound into a mass like that of the 
ventral sucker, and marked off from the parenchyma by a limiting 
membrane. It is crossed by branched muscle fibers, and on its 
surface are fibers running lengthwise and crosswise It contains 
cells which resemble the parenchyma gland cells in appearance. 
There are long protractor fibers attached to its hinder end, which 
run forward through the parenchyma and are attached to the body- 
wall. Distinet retractor fibers were not seen, but indications of 
them are present. 
There is a very short oesophagus (Fig. 8, 5, 18) whose trans- 
verse diameter about equals that of the intestine directly behind it. 
Its wall is composed of muscular tissue in continuation of that of 
the intestine and a layer of cuticle directly continuous with that 
