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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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382 MOLLUSCA BIVALVIA.TI.Valves closed by two adductor muscles.A. Hinge with teeth.a. Teeth numerous in both valves.aa.b. Teeth <strong>of</strong> the hinge simple. Arcade.c.Hinge teeth on a straight line ;a transverse area betweenthe beaks.Area.cc.Cticullea.Hinge-teeth on a bent line.Pectunculus.Nucula.bb. Teeth <strong>of</strong> the hinge transversely striated. Trigoniadce.Trigonia.(Castalia.)Hinge with a single tooth.Avicula.AA. Hinge without teeth.(Meleagrina.)Pinna.

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