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History of British animals - University of Guam Marine Laboratory

History of British animals - University of Guam Marine Laboratory

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MOLLUSCA. BIVALVIA. 381BIVALVIA.ASIPHONIDA.Cloak like open,'the aperture <strong>of</strong> the shell, and permittingthewater to come immediately in contact with the mouth andgills.The margin <strong>of</strong> the cloak has a double fringe<strong>of</strong> filaments.I. Valves closed by one adductor muscle.A. Shell free, or adhering to other bodies by a byssus only ;furnished with a foot.a.Ligament narrow, and confined to a space under the beaks.PECTENIDiE.b. Shell compact.Pecten.Lima.bb.Plagiostoma.(Pedum.)Shell foliated.Gryphcea.(Vulsella.)(Placuna.)aa. Ligament marginal, sublinear, simple or interrupted by thehinge teeth or pits ;shell foliated. Pernad.e.Pema.Gervillea.Crenatula.Inoceramus.(Malleus.)AA. Shell fixed or cemented to other bodies ; inequivalve.a.Hinge plain or destitute <strong>of</strong> teeth. Ostreadcs.Ostrea.Dianchora.(Hinnites.)Anomia.«a. Hinge furnished with teeth. Spondylitics.Spondylus.Plicatula.

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