Introduction

Palombiella stephensoni (Palombi, 1938) is a marine triclad (Phylum Platyhelminthes, Class Turbellaria, Order Tricladida) of the family Bdellouridae. The morphology of the body wall and musculature of this animal as seen by light mocroscopy of histological preparations has been described (Wineera, 1969; 1971). In the present study histochemical methods are employed in an effort to characterize further the various body wall constituents described earlier.