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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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296 MOLLUSCA. PECTINIBRANCHIA,PECTINIBRANCHIA.CRYPTOBRANCHIA.Heart entire, and detached fromthe rectum. Sexes distinct on differentindividuals. The shells <strong>of</strong> the female more ventricose in thebody-whorl than those <strong>of</strong> the male.a. Shell external.b.Aperture <strong>of</strong> the shell entire, together with the anterior margin<strong>of</strong> the cloak at the entrance <strong>of</strong> the branchial cavity. Holostomata.c. Foot with a lid for closing the aperture <strong>of</strong> the shell. Tectipeda.TuRBONiDiE.NeritadjE.straight pillar-lip.Trochusid^e.Aperture <strong>of</strong> the shell ovate or round.Aperture semicircular, with an obliqueAperture subquadrangular.cc. Foot destitute <strong>of</strong> a lid. Nudipeda.Janthina.Velutina.bb.Aperture <strong>of</strong> the shell canaliculated, for the reception <strong>of</strong> the syphon<strong>of</strong> the branchial cavity. Solenostomata.aa.Shell internal.Sigaretus.

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