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The adventitia of the crayfish heart consists of about five layers of uninucleated cells that often contain large amounts of glycogen. The outer and inner boundaries of the adventitia are represented by amorphous, homogeneous layers that are rich in neutral and acidic carbohydrates. J. MDRPH., 131: 237-252. LITERATURE CITED Alexandrowicz, J. S. 1932 The innervation of the heart of the crustacea: I. Decapoda. Quart. J. Micr. Sci., 7: 181-249. Baumann, H. 1921 Das Gefassystem von Astacus fluviatilis (Potamobius astacus L.) Z. Wiss. Zooll, 1 1 8: 246-312. Dreszo, B. 1878 Uber das Herz des Flusskrebes und des Hummers. 2001. Anz., I : 126-127. Freeman, J., and B. Spurlock 1962 A new epoxy embedment for electron microscopy. J.Cell. Biol., 13: 437-443.