. Elementary text-book of zoology. ANODONTA, 273 supra-branchial chambers from the mantle-cavity below. Posteriorly these lead into the exhalent chamber. The water appears to pass between the gill-filaments directly into the supra-branchial and exhalent chambers, aerating the blood in the gill-filaments in its course. The food-particles appear to pass forward to the mouth, which is situated just under the anterior adductor muscle. They are assisted by a pair of fiat triangular labial palps in each side. From this it is seen that the ctenidia serve the two purposes of alimentation Fig. ig2.—Dis
. Elementary text-book of zoology. ANODONTA, 273 supra-branchial chambers from the mantle-cavity below. Posteriorly these lead into the exhalent chamber. The water appears to pass between the gill-filaments directly into the supra-branchial and exhalent chambers, aerating the blood in the gill-filaments in its course. The food-particles appear to pass forward to the mouth, which is situated just under the anterior adductor muscle. They are assisted by a pair of fiat triangular labial palps in each side. From this it is seen that the ctenidia serve the two purposes of alimentation Fig. ig2.—Dissection of Anodonta from Left Side (Slightly Diagrammatic). Aperture of Kidney into Pericardium. i;^ Digestive Gland. Dorsal | S Ventricle of Aperture of Digestive I Artei-y. I :^ Heart. Pericardium, Gland into Stomach, \ . Ill 1 X \ \ / / / / Intestine, Anterior Adductor, V Posteiior Adductor, _^ Visceral Ganglion, Pedal Ganglion,- | intestine. Kidney. Gonad. (food ingestion) and of respiration. They appear to be derived from organs of the same nature as the gills of other molluscs. The mouth leads into a short (esophagus ^assmg into a globular stomach, into which open the ducts of a digestive gland. From the stomach the long intestine de- Allmentary. ^^^^^^ -^^^^ ^Yi& base of the foot, and after com- plex coils it again ascends to the dorsal region and passes backwards over the posterior adductor muscle to open by an anus into the exhalent aperture. We may note the entire absence of " head," buccal mass and odontophore. M 19. 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 Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone
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