. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. %»y^,. contrary, the auricles do not receive the blood until it has been exposed to the revivifying influence of the organs of respiration. Of the, organs of respiration.— The whole of the Conchiferous mollusks respire by means of branchiae (e, e,jig. 346). These or- gans are variously disposed according to the form of the animal. They are symmetrical; and in almost all the genera there are two on each side. The branchiae generally present the form of membranous leaflets, of a qua- drangular shape, though often unequal.
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. %»y^,. contrary, the auricles do not receive the blood until it has been exposed to the revivifying influence of the organs of respiration. Of the, organs of respiration.— The whole of the Conchiferous mollusks respire by means of branchiae (e, e,jig. 346). These or- gans are variously disposed according to the form of the animal. They are symmetrical; and in almost all the genera there are two on each side. The branchiae generally present the form of membranous leaflets, of a qua- drangular shape, though often unequal. They are broad and short when the animal is glo- bular, elongated and narrow when the animal is lengthened in its general form. In the greater number of genera the branchiae are formed of two membranous layers or laminae (a, b, Jig. 352) within the substance of which the branchial vessels descend with great regu- larity. In several genera, as the Archidae and Pecten, the branchial vessels, instead of being connected parallel to one another within the thickness of a common membrane, continue unconnected through their entire length, and they are thus formed of a great number of extremely delicate filaments attached by the base within a membranous pedicle, in which the branchial veins pursue their way towards Fig. 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 Todd, Robert Bentley, 1809-1860. London, Sherwood, Gilbert, and Piper
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