: Planaria (whole mount), hematoxylin; represents the general structures of typical triploblastic animals. Planaria, Carbon-fed (whole mount), Schneider's; digestive system is filled with carbon, making branches and diverticula visible. Planaria, Plain and Carbon-fed (whole mount), Schneider's and hematoxylin; Comparitive slide of both a plain and carbon-fed animal, side by side. Planaria, three regions (cross section), hematoxylin and triosin; Composite, illustrates the triclad gastro vascular cavity of flat worms. Anterior, middle, and posterior regions are represented.