



(LASS v CEPHALOPODA 503 



funnel-shaped muscular swimming -organ ; mouth provided with jaws and radnl. 



fication des Ceratites do la (.'rait- (ibid. XVIII. p. L'7/i), 1890. /;///>////. IT. /;.. i:-.,.|it Explorations 

 in the \Vappin-er Valley Limestone (Amer. .Jmirn. S.-i. [:!|, ToL XXVII. p. L'19), 1884. 



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 bojda Endoceras-Arter (Geol. Foren. Stockholm Forhandl., Bd. XIV. Hefte 2, 3), 1892. Om de 

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