NERVOUS SYSTEM-The nervous system is developed and resembles the turbellarian .The brain form the a collar or ring(cerebral ring) around the pharynx and bears a pair of lateral cerebral ganglia and a ventral ganglion.Three pairs of longitudinal nerve cords extend posteriorly,giving out numerous fine peripheral branches, to the various organs,of the three pairs of nerve one pair is dorsal, one ventral and one lateral.Between the dorsal and ventral cords, the lateral cords are well developed and connected by a few transverse commissures.
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