Elements of zoölogy a Elements of zoölogy : a textbook elementsofzolo00tenn Year: c1875 Leda limatula. New England. Unio clava, Lam. Reduced. Western States. A more recent classification, that of Dr. Gill, in the paper cited on page 406, recognizes five Orders : 1. DlMYARIA, as Aspergillum, Gastrochcena, Teredo, PJiolas, Solen Mya, Pandora, Mactara, TeUina, Cytfierea, Astarte, Cardium, Unio, Leda, etc., etc. 2. , as Tridaena, etc. 3. HETEROMYARIA, as Mytilus, etc. 4. MONOMYARIA, as Pinna, Spondi/lus, Malleus, Pecten, Ostrea, etc. 5. RUDISTA—Coral-like mollusks—all fossil.

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