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“Diagrammatic cross-section of Cray-fish in the thoracic region, to show relation of circulation and respiration. a, appendage; c, carapace; c.f., flap of carapace overhanging the gills; d, digestive tube; g, gill; h, heart; l, liver; m, body muscles; m’, muscles of the appendages; n.c., nerve cord; p.s., paricardial sinus; r, reproductive glands; st, sternal artery; v.a., ventral artery; v.s., ventral blood sinus in which the nerve cord lies.” — Galloway




Thomas Walton Galloway, Zoology A Text-Book For Secondary Schools, Normal Schools and Colleges (Philadelphia: P. Plakiston's Son & Co., 1913) 279


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