. Conchologia cestrica. The molluscous animals and their shells, of Chester county, Pa. Mollusks. CONCHOLOGIA CESTRICA. 85 Station, Susquehanna River and tributaries; abun- dant. Lingual dentition of A. di.ssimilis. — [Troschel.] Fig. 180.. Class ACEPHALA. In this class the shell is bivalve, the valves being united at the back, by a hinge, as in the common creek mussel. Animal, acephalous; the mouth is a simple aperture, without teeth, or jaws, and often takes the form of a tube, reaching even beyond the shell, and accompanied by another — the vent; which are simple, or fringed. Respiration is
![. Conchologia cestrica. The molluscous animals and their shells, of Chester county, Pa. Mollusks. CONCHOLOGIA CESTRICA. 85 Station, Susquehanna River and tributaries; abun- dant. Lingual dentition of A. di.ssimilis. — [Troschel.] Fig. 180.. Class ACEPHALA. In this class the shell is bivalve, the valves being united at the back, by a hinge, as in the common creek mussel. Animal, acephalous; the mouth is a simple aperture, without teeth, or jaws, and often takes the form of a tube, reaching even beyond the shell, and accompanied by another — the vent; which are simple, or fringed. Respiration is Stock Photo](https://c8.alamy.com/comp/REC6YB/conchologia-cestrica-the-molluscous-animals-and-their-shells-of-chester-county-pa-mollusks-conchologia-cestrica-85-station-susquehanna-river-and-tributaries-abun-dant-lingual-dentition-of-a-dissimilis-troschel-fig-180-class-acephala-in-this-class-the-shell-is-bivalve-the-valves-being-united-at-the-back-by-a-hinge-as-in-the-common-creek-mussel-animal-acephalous-the-mouth-is-a-simple-aperture-without-teeth-or-jaws-and-often-takes-the-form-of-a-tube-reaching-even-beyond-the-shell-and-accompanied-by-another-the-vent-which-are-simple-or-fringed-respiration-is-REC6YB.jpg)
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. Conchologia cestrica. The molluscous animals and their shells, of Chester county, Pa. Mollusks. CONCHOLOGIA CESTRICA. 85 Station, Susquehanna River and tributaries; abun- dant. Lingual dentition of A. di.ssimilis. — [Troschel.] Fig. 180.. Class ACEPHALA. In this class the shell is bivalve, the valves being united at the back, by a hinge, as in the common creek mussel. Animal, acephalous; the mouth is a simple aperture, without teeth, or jaws, and often takes the form of a tube, reaching even beyond the shell, and accompanied by another — the vent; which are simple, or fringed. Respiration is performed by two, or four, broad leaves, or gills, which hang down on the sides of the body, within the mantle, and are embraced by the shell, like the leaves of a book by the cover. The animal is either free, as the mussel, or attached, as the oyster. Their food is only such animal, and vegetable, matters, as the water may chance to carry into their suctorial mouths. They are bisexual, as the mussel; or hermaphrodite, and capable of self-impregnation, as the oyster. Order BRANCHIFERA. Characters the same as those of the class. s. 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 work.. Hartman, William Dell, 1817-1899; Michener, Ezra, 1794-1887. Philadelphia, Claxton, Remsen & Haffelfinger