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Show 1877.] ANTHOBRANCHIATE NUDIBRANCHIATE MOLLUSCA. 199 Order NUDIBRANCHIATA, Cuvier, 1817. Doris, Miiller, 1776. Dermobranches (Dermobranchiata) a, corps nu, Dumeril, 1806. Les Tritoniens (Tritoniacea), Lamarck, 1819. Hydrobranches (part of), Lamarck, 1819. Gymnobranchia, Schweigger, 1820. Notobranchia (part of), Bronn, 1862. Opisthobranchiate, hermaphrodite Mollusca, with the branchiae, if present, more or less exposed on the back or on the sides ; without shell when adult. Suborder I. ANTHOBRANCHIATA, Goldfuss, 1820. Cyclobranches (Cyclobranchiata), De Blainville, 1814. Pygobranchia, Gray, 1821. Dorididee, Leach, 1820. Dorides, Fe'russac, 1821. Urobranchia, Latreille, 1825. Doridice, Menke, 1828. Doridee, D'Orbigny, 1837. Doridiacea, Philippi, 1853. Acanthobranchiata, Alder and Hancock, 1855. The branchiae more or less surrounding the anus upon the medio-dorsal line. Fam. I. DORIDID.E, Aid. & Hanc. 1855. Doridini, Ehr. 1831. Doris bombees et planes, Cantr. 1840. Dorina, Macgillivray, 1843. Doridinee, Aid. & Hanc, 1845. Doridina, Gray, 1847. Mantle (notheeum) large, without marginal appendages; skin generally very spiculose ; dorsal tentacles (rhinophora) laminate and retractile within cavities. The Dorididae may be classed under two sections or subfamilies :- § 1. Those with the oral tentacles free ; and with the odontophore broad and bearing numerous spines in each transverse row. (PI.ATYGLOSS.-E.) § 2. Those with the oral tentacles united into an oral veil; and with the odontophore narrow and strap-sbaped, and bearing but few spines in each transverse row. (LEPTOGLOSS;E). § 1. PLATYGLOSS^E. Genus DORIS, Linnaeus, 1758. Argus, Bohadsch. Body depressed, or subconvex; integument spiculose; mantle often tuberculate, covering the head and the foot; branchiae plumose or ramose, united at the base, and retractile with the anus into a common pallial cavity; mouth inferior, with two distinct oral ten- |