58 Wisconsin Academy of Sciences , Arts and Letters. 
EXPLANATION OF PLATE III. 
Fig. 10. Epithelial cells of mid-intestine, with a regenerating center 
(rc):— sm, striated intima; nep, nucleus of epithelial cell; Is, longi¬ 
tudinal striations of cytoplasm; bm, basement membrane, (x 760.) 
Fig. 11. Epithelial cells of mid-intestine, with secretory processes: — 
Isp, large secretory process; ssp, small secretory process; sp, secretory 
process which has been constricted off from epithelial cell and is free 
to circulate in the mid-intestine; sm, striated intima of epithelial 
cells; Is, longitudinal striations of cytoplasm; bm, basement mem¬ 
brane. (x 640.) 
Fig. 12. Cells of ileum:— nep, nucleus, which takes up the greater 
part of the cell; ch, chitinous intima; the muscular layers are not 
shown, (x 760.) 
Fig. 13. Longitudinal section through mid-intestine and hind-in^ 
testine, showing pyloric valve ( pv ):—bo, boundary between mid¬ 
intestine and hind-intestine; ep, epithelium; sm, striated intima of 
epithelial cells of mid-intestine; mlp, Malpighian tubule opening into 
mid-intestine; elm, external longitudinal muscles; cm, circular muscles; 
him, branch of external longitudinal muscles; ch, chitinous intima. 
(x 80.) 
