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The Body Wall and Musculature of the Marine Triclad Palombiella stephensoni (Palombi, 1938): Part One: General Tissue Structure as seen with the Light Microscope

Plate 3

page 12

Plate 3

page 13
Plate 3. The Eosinophil Glands

Plate 3. The Eosinophil Glands

Fig. 1 Transverse section of the dorso-lateral epidermis. Eosinophil secretions within the parenchyma are entering the bases of 2 epidermal cells. At the surface of the epidermal cells is a row of "papillae". Stained with Delafield's haematoxylin and eosin, photographed by Nomarski interference microscopy.

es., eosinophil secretion; n., nuclei of epidermal cells; pa., parenchyma; p., papillae.

Fig. 2 Transverse section showing subepidermal eosinophil glands opening to the ventro-lateral surface. The secretions reach the surface by passing through epidermal cells. Fan-shaped systems of ducts are formed within the epidermal cells. "Papillae" are seen where secretions reach the surface. Stained with the Falg technique and photographed by Nomarski interference microscopy.

e., epidermis; es., eosinophil secretion; p., papillae; pa., parenchyma.

Fig. 3 Tangential section of epidermis at a region where eosinophil secretions reach the surface. The section is at a level corresponding to C-D in Plate 1, Fig. 1. The arrangement of the secretion masses is evidence that the secretions actually pierce epidermal cells, and do not reach the surface by penetrating between epidermal cells. Falg staining, photographed by Nomarski interference microscopy.

es., eosinophil secretion; im., region of internal channels of epidermis.

Fig. 4 Tangential section of epidermis at a level corresponding to A-B in Plate 1, Fig. 1. The polygonal patern of cells is apparent. One cell (arrowed) contains large eosinophil secretory ducts from underlying glands. Stained and photographed as for Fig. 3.

p., pigment.