. Catalogue of the Mollusca in the collection of the British Museum. Mollusks -- Catalogs and collections. Fig. 1. Dorsal valve;—7. cardinal process; t'. dental sockets ; p. hinge-plate; s. septum; r. crura of the loop; /. reflected portion of the loop; m. quadruple adductor- impression. Fig. 2. Ventral valve:—/, foramen; d. deltidium; t, teeth; a. adductor-im- pression ; r. retractor impressions ; p. pedicle-muscles ; .j. anal muscles ; v. posi- tion of the vent; z. attachments of peduncle-sheath. Animal always attached by a peduncle; furnished with cirrated arms, united throughout by membran
. Catalogue of the Mollusca in the collection of the British Museum. Mollusks -- Catalogs and collections. Fig. 1. Dorsal valve;—7. cardinal process; t'. dental sockets ; p. hinge-plate; s. septum; r. crura of the loop; /. reflected portion of the loop; m. quadruple adductor- impression. Fig. 2. Ventral valve:—/, foramen; d. deltidium; t, teeth; a. adductor-im- pression ; r. retractor impressions ; p. pedicle-muscles ; .j. anal muscles ; v. posi- tion of the vent; z. attachments of peduncle-sheath. Animal always attached by a peduncle; furnished with cirrated arms, united throughout by membrane, folded upon themselves, and only s])iral at their extremities; muscles of three kinds,— adductors, retractors, and those which go to the peduncle {byssal or pedal muscles of ordinary bivalves). The adductors are at- tached to four s])0ts near the centre of the dorsal valve (m), and to a single spot behind the centre of the opjiosite valve («); the retractors originate on each side of the adductor in the ventral valve (r), and are attached to the cardinal process (j) of the dorsal valve; the hinge-teeth form the ftdcrum on which the dorsal valve turns ; of the pedicle muscles, two (p) originate outside the adductor and behind the retractors in the ventral valve : two. 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 British Museum (Natural History). Dept. of Zoology; Gray, John Edward, 1800-1875. London Printed by order of the Trustees
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