Abstract
The nervous system of Graffilla pugetensis is demonstrated by the use of the acetylthiocholine iodide technique. It consists of a bilobed brain, 5 pairs of longitudinal nerve trunks, 3 transverse commissures, paired nerves to the pigment-cup ocelli, and nerve plexuses around the pharynx and genital atrium. This is the first report of 5 pairs of nerve trunks and 3 transverse commissures in a rhabdocoel turbellarian. Graffilla pugetensis Schell, 1986, is a parasite in the pericardial cavity of the bent-nose clam, Macoma nasuta, in the vicinity of the San Juan Islands, Washington. Because rhabdocoel ner-
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