By running the tip of the finger forward over the ventral surface of the body, thin bristles, chaetae, may be felt. These are moved by internal muscles and assist in locomotion. Two sperm grooves run between the inner and outer rows of chaetae from the clitellum to the sperm duct openings. Other openings to the surface should now be identified. Low power magnification will assist you in seeing these and the next two types of openings.
Dorsal pores are openings from the coelom to the outside.
These lie in the dorsal line between segments. Cover the worm with water. Do not cut deep or the gut will be cut. Now continue cutting in the dorsal line forward, pinning out the flaps after severing the septa which join the intestine and the body wall. Not the large body cavity, a coelom, surrounding the organs.