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ABSTRACT The organization of the muscle cell layer surrounding the tubules of the midgut gland in Homarus americanus was examined with transmission and scanning electron microscopy. This layer contains a uniform network of broad circular myofilaments interconnected by smaller longitudinal connectives. The primary means of constriction of the lumen of the tubule appears to be by contraction of the circular muscle fibers. The longitudinal myofilaments may provide both structural support and a means for conducting the contractile impulse along the tubule.