20 
FIG. 12. — Enlarged view of a midgut portion of a 'worm cleared in glycerine, as seen dorsally or 
ventrally. Note the following characters: The clear line in the’middle represents the median 
line or band; near this is seen a fine mesh work which represents the surface ■new of the intesti- 
nal epithelium, as seen upon deep focus; above is a much coarser network, which represents the 
surface view of the reticulum (compare fig. 6) between the muscular layer and the intestine; 
the broad band, occupjdng more than half the figure, is the intestine; laterally of this there is on 
each side a dark band, representing the excretory glands; lateral of these are the areas of the 
lateral bands, with their nuclei; then the subcuticula, and finally the cuticula. 
Rectum . — The rectum (ligs. 7-9) is about 200>u long. Several large 
nuclei are visible in this region, and certain cell boundaries can be dis- 
the cuticle of the lumen is 6.6 to 8.8yw thick, and in the posterior por- 
tion of the midgut this cuticle mav show a rod-like structure. In the 
anterior quadrangular portion of the midgut, fibres ‘run from the 
submedian corners toward the body wall. 
