This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1870 edition. Excerpt: ... 3rd chambers are filled only with spar, of the same kind ns that within these chambers, these fractures could not have existed when the mud of the Lias formation entered the siphuncle, without admitting it also into the chambers acljac-out to them. VOL. ll. P PLATE 50. Vol. I. p. 278, note. Drawing of the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1870 edition. Excerpt: ... 3rd chambers are filled only with spar, of the same kind ns that within these chambers, these fractures could not have existed when the mud of the Lias formation entered the siphuncle, without admitting it also into the chambers acljac-out to them. VOL. ll. P PLATE 50. Vol. I. p. 278, note. Drawing of the animal of the Nautilus Pompilius, prepared at my request by Mr. Owen, to show the manner in which the siphuncle terminates in the pericardium. (Original.) a. The heart. b. A bristle passing from the pericardium through the membranous siphunclc laid bare. c. Bristles passing from the pericardium through the orifices of communication with the branchial chamber. d, d, d, d. Follicles communicating with the branchial arteries. -d, d, d, d. Pericardial septa, forming thin muscular receptacles of the follicles. e, e. The branchias. f. The branchial chamber. g. The funnel, or branchial outlet. ' Mr. Owen supposes that these follicles discharge the impurities of the blood into the pericardium, when thcre is no access of water to the branchim, during the time that the animal is contracted within its shell. The overflowing-s ot-this pericardial fluid may pass out through the orifices marked by the bristles, c, c. h. The infundibular valve. 1., i. The digital processes. k. The gizzard. l. The ovary.-m, m. The mantle dissected off. n. The membranous siphuncle. 0, 0. The siphuncular artery. p, p. The boundaries of the pericardial cavity. q. Portion of the siphunclc between the pericardium and first transverse plate of the shell.1 1. This upper portion or neck of the siphunclc has the form of a flattened canal, with thin purietes of the same substance as the pericardium. When the animal expands itself at the bottom of the sea, this...
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