. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ACCESSORY HEARTS IN THE OYSTER 347 It was stated by Leenhardt concerning the Portuguese oyster. (i~r\'plica (Ostrca) aiKjulata (1926. p. 82) that: " Les branchies ne recnivent que du sang provenant de 1'organe bojanien, mais les lacum> de cet organe communiquent avec une grosse veine afferente du coeur qui pent ramener directenient le sang a I'oreillette sans passer par la ; He considered that the circulatory system of the gills is " adrift " on the lacunae of the excretory organ which has a m
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ACCESSORY HEARTS IN THE OYSTER 347 It was stated by Leenhardt concerning the Portuguese oyster. (i~r\'plica (Ostrca) aiKjulata (1926. p. 82) that: " Les branchies ne recnivent que du sang provenant de 1'organe bojanien, mais les lacum> de cet organe communiquent avec une grosse veine afferente du coeur qui pent ramener directenient le sang a I'oreillette sans passer par la ; He considered that the circulatory system of the gills is " adrift " on the lacunae of the excretory organ which has a much larger vessel leading into the heart, so that there would be little pressure to force blood through the gills. However, he did not observe the accessory FIG. 1. Diagrammatic view of oyster from left side with part of mantle re- moved along double line (X). A, adductor muscle; AH, accessory heart (which is actually on inner face of mantle) ; AV, afferent vein; B, organ of Bojanus; G, outline of underlying gill; H, heart; J\I, marginal artery of mantle; P, labial palp; ]', medial vein forming insertion of the two medial demibranchs. Although not previously recognized as active organs, Kellogg (1890, Fig. 9) shows them in a figure of a cross-section through the cloaca, but refers to them only as ridges " running backward on inner wall of mantle, continuous with line of concrescence of gill to ; He failed to identify them as vessels since they were probably fixed in a state of contraction. It proved difficult to inject the accessory hearts of a living specimen because of their marked sensitivity to mechanical stimulation. Even in an oyster anaesthetized with magnesium sulphate the slightest stimula- tion of the vessels caused them to contract. By leaving oysters in a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfe
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
