Entomology : with special reference to its biological and economic aspects . Portion of Malpighiantube of caterpillar, Sainiacecropia, surface view.. 7. Circulatory SystemInsects, unlike vertebrates, haveno system of closed blood-vessels,but the blood wanders freelythrough the body cavity to entereventually the dorsal vessel, which °^ silkworm, Bombyx mori. b, basement membrane; c, crystals; i, resembles a heart merelv in being intima; /, lumen; n, nucleus; p. a propulsatory organ. p^*°^ ^- ^^^ magnified. Dorsal Vessel.—The dorsal vessel (Figs. 158, 162) is a delicate tube extendinsf alono- th
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Entomology : with special reference to its biological and economic aspects . Portion of Malpighiantube of caterpillar, Sainiacecropia, surface view.. 7. Circulatory SystemInsects, unlike vertebrates, haveno system of closed blood-vessels, but the blood wanders freelythrough the body cavity to entereventually the dorsal vessel, which °^ silkworm, Bombyx mori. b, basement membrane; c, crystals; i, resembles a heart merelv in being intima; /, lumen; n, nucleus; p. a propulsatory organ. p^*°^ ^- ^^^ magnified. Dorsal Vessel.—The dorsal vessel (Figs. 158, 162) is a delicate tube extendinsf alono- the median dorsal line immedi- Cross section of Malpighian tube ANATOMY AND PHYSIOLOGY 12^ ately under the integument. A simple tube in some larvae, itconsists in most adults chiefly of a series of chambers, each of Fig. 158.