509 
3) There is no basement membrane beneath the epidermis. 
4) The gland cells are of but one kind, and develop from basal 
cells, not from the supporting cells. 
5) The epidermis contains sensory celis (ganglion cells) of jug or 
spindle form. These may be isolated, or aggregated into loose groups, 
or united into definite sense organs. From the sense cells, nerve 
fibers pass to the central nervous system; and sensory hairs project 
thro the cuticle to the exterior. 
6) Isolated sensory cells occur over the whole worm. They are 
numerous over the prostomium and anterior body segments, diminish 
in number in the tube covered region, and are again more numerous 
over the caudal end. 
7) Isolated sensory cells upon the anterior segments of the body 
may bear more than a single hair. 
8) Groups of sensory cells are found on all regions of the body, 
except the prostomium and anterior two or three segments. 
9) Sense organs occur only upon the prostomium and first few 
segments of the body, and are most numerous in the former situation. 
Ann Arbor, Michigan, Aug 28, 1899. 
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