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History of British animals - University of Guam Marine Laboratory

History of British animals - University of Guam Marine Laboratory

History of British animals - University of Guam Marine Laboratory

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MOLLUSCA. PECTINIBRANCHIA. 361PECTINIBRANCHIA.SCUTIBRANCHIA.Heart with two auricles traversed by the rectum ; sexes incorporated ;body covered with a patulous shell;the foot destitute <strong>of</strong> a lid.I. Shell ear-shaped, with a lateral and nearly concealed spire.Haliotis.(Padola.)(Stomatia.)II.Shell oblong or conical, simple or subrevolute.Crepidulid^e. Cavity <strong>of</strong> the shell interrupted by a testaceousplate.a. <strong>Marine</strong>.b. Plate <strong>of</strong> the cavity spirally decurrent.bb.Calyptraea.Infundibulum.Plate <strong>of</strong> the cavity horizontal.Crepidula.Pileolus.aa.Fluviatile.Navicella.Capulid-E. Cavity and margin <strong>of</strong> the aperture entire.Capulus.(Carinaria.)Fissurellad^e. Cavity entire ; shell with a perforationor slit.Fissurella.Emarginula.Scissurella.

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