The dorsal surface is probably up on the slide, facing you. Tha anterior end is specialized to form a triangular head which contains the brain and bears the eyes but not the mouth. The remainder of the body is the trunk . The posterior extent of the head is marked by a pair of lateral, supposedly earlike protrusions, the auricles . These chemosensory organs are often inconspicuous in preserved specimens.
Planarians have a pair of dark pigment cup ocelli , or eyespots.
The two black pigment cups of Dugesia are easily seen near the middle of the head. The cups face laterally. The digestive system is faintly discernable but is better studied using a specimen that had been fed some colored substance such as carmine or carbon black and thus has a gut filled with pigment. A wholemount of such a specimen should be available, either on the slide you are now using or mounted separately. Examine one of these specially prepared specimens.