. La biologia degli animali marini. Animali marini; fisiologia, comparativo. (A) -^^ (b) Fig. 5.11. Diagrammi che mostrano l'organizzazione del mantello in cavità (a) un Protobranch Nucula, e (b) un tipico Lamellibranch come Ostrea vista trasversale attraverso il corpo, con camera exhalant sopra e inalante camera al di sotto le branchie. Direzione delle correnti d'acqua indicata dalle frecce passando attraverso le branchie; direzione dei flussi di cibo dalle frecce sulla superficie di branchie; diretto in avanti di flussi per bocca indicata con x. (Da Yonge, 1928.) regione (Fig. 5.12 (b)). In molti altri lamellibranchs, in- escur e

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. The biology of marine animals. Marine animals; Physiology, Comparative. (a) -^ ^ (b) Fig. 5.11. Diagrams Showing the Organization of the Mantle Cavity in (a) A Protobranch Nucula, and (b) a Typical Lamellibranch such as Ostrea Transverse view across the body, with exhalant chamber above, and inhalant chamber below the gills. Direction of water currents indicated by arrows passing through the gills; direction of food streams by arrows on surface of gills; forwardly directed streams to mouth indicated by x. (From Yonge, 1928.) region (Fig. 5.12 (b)). In many other lamellibranchs, in- and excurrents enter and leave the mantle cavity by way of siphons at the posterior end of the body, elsewhere the mantle folds being largely fused. Water currents are created by the lashing of lateral cilia on gill filaments or leaflets, as illustrated in Fig. 5.13. In protobranchs the gills consist of a series of flat leaflets on either side of the body. In other lamellibranchs the gills on either side usually consist of two lamellae or demibranchs, each of which is made up of a series of ascending and descending filaments united at their free extremities. The lateral cilia cause a current to flow through the narrow slits between the gill filaments or leaflets, from the inhalant into the exhalant chamber. On the outer surface of the filaments are frontal cilia which are chiefly responsible for collecting food particles. In proto- branchs the frontal cilia transport particles to the mid-line, whence they. 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 perfectly resemble the original work.. Nicol, J. A. Colin (Joseph Arthur Colin), 1915-. New York, Interscience Publishers

Parole chiave associate all'immagine

• bookcentury1900
• booksubjectmarineanimals
• booksubjectphysiology