. A manual of zoology. 268 MANUAL OF ZOOLOGY in an oval mark, the anterior adductor impression (a. ad), into which is inserted one of the muscles which close the. a-acl Fig. 159. — Anodonta cygnea. A, interior of right valve; B, the animal removed from the shell, a. ad, anterior adductor or its impression; a. r, anterior retrac- tor or its impression; , digestive gland, seen through mantle; ex. sph, exhal- ant siphon; ft, foot; gi, gills, seen through mantle; h. I, hinge-line; in. spli, inhalant siphon; kd, kidney, seen through mantle; k. o, Keber's organ, seen, through mantle; jn, mantle:
. A manual of zoology. 268 MANUAL OF ZOOLOGY in an oval mark, the anterior adductor impression (a. ad), into which is inserted one of the muscles which close the. a-acl Fig. 159. — Anodonta cygnea. A, interior of right valve; B, the animal removed from the shell, a. ad, anterior adductor or its impression; a. r, anterior retrac- tor or its impression; , digestive gland, seen through mantle; ex. sph, exhal- ant siphon; ft, foot; gi, gills, seen through mantle; h. I, hinge-line; in. spli, inhalant siphon; kd, kidney, seen through mantle; k. o, Keber's organ, seen, through mantle; jn, mantle: /. ad, posterior adductor or its impression; pc, pericardium, seen through mantle; pi. 1, pallial line; //. ;;/, pallial muscles; p. r, posterior retractor or its impression ; pre, protractor or its impression. shell. A similar but larger posterior adductor impression {p. ad) lies beneath the posterior end of the hinge. The shell consists of three layers. Outside is a brown horn-like layer, the periostracum (Fig. 160, prs), composed. 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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