. A manual of zoology. XI PHYLUM MOLLUSCA 293 secondary gills — vascular processes of the wall of the Fig. 180. — Pulmonary cavity and related parts in a slug (Limax). anrt, aorta; aur, auricle; urp/i, nephridium; pen'c, pericardium, laid open; pul. ap, pul- monary aperture; pul. 71, pulmonary vein with its ramifications; red, rectum; Mr, ureter; z'cnt, ventricle. (After Digestive Organs. —In many Gastropods there is a long proboscis capable of being everted and retracted, at the extremity of which the mouth is placed. A single curved horny jaw lies on the roof of t
. A manual of zoology. XI PHYLUM MOLLUSCA 293 secondary gills — vascular processes of the wall of the Fig. 180. — Pulmonary cavity and related parts in a slug (Limax). anrt, aorta; aur, auricle; urp/i, nephridium; pen'c, pericardium, laid open; pul. ap, pul- monary aperture; pul. 71, pulmonary vein with its ramifications; red, rectum; Mr, ureter; z'cnt, ventricle. (After Digestive Organs. —In many Gastropods there is a long proboscis capable of being everted and retracted, at the extremity of which the mouth is placed. A single curved horny jaw lies on the roof of the buccal cavity in the Pul- monata; in most marine Gastropoda the place of this is taken by two lateral pieces. A characteristic feature of the alimentary canal of the Gastropoda, which, however, they share with some Amphi- neura and with the Cephalopoda, is the possession of an odontophore and radula, situated in a thick-walled chamber, the buccal cavity, into which the mouth opens. From the floor of the cavity rises an elevation, the odontophore, which is somewhat elongated in the direction of the long axis of the body and compressed laterally. Over the summit of the odontophore runs longitudinally a narrow strap-like body, the radula or lingual ribbon (Fig. 181, rad), beset. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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