GEROULD: CAUDINA. 153 
side of the unicellular gland, the contents of which appear in 
sections as vacuolated matter of a fibrous nature. These cells 
correspond to the tubular gland cells of the epidermis. 
Wandering cells of two kinds are found in the wall of the 
pharynx. They are (1) the ordinary spheruliferous corpuscles 
(Plate 5, fig. 51, cp. sph.) and (2) amoeboid cells (Plate 5, fig. 51, 
cl. vag.). These differ from the former in two respects; they 
stain diffusely with haematoxylin, instead of absorbing eosin, and 
are composed of homogeneous protoplasm without spherules. The 
second form of wandering cell is probably a modification of the first, 
B. The epithelium of the stomach (Plate 5, fig. 52) is made up 
of columnar supporting cells, about 50 y in length surmounted by 
a very thin cuticula. Oval nuclei (5.5 m by 3.6 a) each with 
several nucleoli, are found at various heights between the attached 
and free ends of the epithelial cells. These cells often have 
a vacuolated appearance, the free extremity of the cell contain- 
ing a greater amount of granular protoplasm — which stains deeply 
with eosin— than the deeper part of the cell. Spaces between the 
supporting cells indicate the position of gland cells, 
Wandering cells of two sorts are also found here: (1) the ordi- 
nary clear, spheruliferous eorpuscles (Plate 5, fig. 52, cp. sph.), which 
are very abundant in the underlying stratum of connective tissue 
and are found even at the surface of the epithelium, and (2) cells 
containing smaller spherules or granules; these are denser and 
consequently more deeply colored in stained sections (Fig. 52, 
cp. S. ). 
y. The epithelium of the small intestine (Plate 5, figs. 54 and 
55) consists of slender cylindrical cells about 40 u in length. The 
basal half of each cell, in which the nucleus is situated, consists of 
dense protoplasm, whereas the free end either presents a vacuolated 
appearance or contains protoplasm of a thin consistency, staining 
less deeply than the contents of the basal part of the cell. The 
cell outlines are everywhere sharp. 
There is no clear continuous cuticula over the epithelium of the 
small intestine, such asis found elsewhere in the alimentary tract, 
but in place of it each cell is capped with a dome of homogeneous 
material which stains deeply with eosin, so that sections of the 
epithelium show a notched outline. Clear spheruliferous bodies are 
to be seen in this epithelium, and rarely I have found in fresh material 
a bright red, spheruliferous, wandering cell, which I suppose to be 
