Identifier: lecturesoncompar02owen (find matches)
Title: Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons
Year: 1855 (1850s)
Authors: Owen, Richard, 1804-1892
Subjects: Invertebrates Anatomy, Comparative
Publisher: London : Longman, Brown, Green & Longmans
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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ex circulating system in the Ilolothuria is in great partrepresented in this diagram (^^. 100.) in connection with the equallyextensive system of chylaqueous sinuses and canals which regulate the protrusion andretraction of the nu-merous tubular feet.The most importantpart of the circu-lating system is thetrunk (e), which runsalong the free borderof the intestine, andwhich is character-ised by the shortand wide vessel (di-vided at y^/) homo-logous with the heartin the Echinus, andwhich connects thecorresponding ves-sels of the two prin-cipal folds of theintestine. The in-testinal capillariesreunite, performingat the same time theoffice of absorbentsand conveying thechyle to the greatintestinal vein (^),from which proceedthe singular andbeautiful respiratoryplexuses (A, h),w^hich are submit-ted to the influenceof the sea water bycontact with thebranchial trees (w, 72). Holothuria. (CLXVIT.) x Jii j The aerated bloodis conveyed to a great mesenteric trunk (i, i), or branchial vein, from
Text Appearing After Image:
i ECIIINODERMATA. 211 which it is transmitted to the parietes of the body, and returns bythe cloaca to form the intestinal artery. The ampulla Poliana (fig. 100. a\ which is double in some species,is the homologue of the blind sacculi, which supply the circular chyla-queous canal sending off the vessels to the bases of the feet in theAsterias. It transmits its fluid principally to an annular reservoirround the pharynx (h\ whence proceed the canals of the oral ten-tacula (c) and those supplying the tubular tentacles or feet whichperforate the coriaceous integument. The latter canals (d, d) rundown in the interspaces of the pairs of muscles, and distribute trans-verse branches to the bases of the tubes as they proceed. Hunter * has figured certain glandular sacs opening into the stemof the hollow branchi^ (?^, ^^), which may be regarded as a rudi-mental form of an excretory or renal system. The chief divisions of the nervous system consist of the pharyngealring, which is closely applied

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