. Cassell's natural history. Animals; Animal behavior. Tritonia, Scyllcea, Tethys, Bormlla, FAMILY , In the genera PhyUidia and Diphyllidla the animal is sht covered by the mantle; the gills form a series on both sides of the body, between the foot and the mantle. They are found in Britain, Norway, and the Red Sea. Division h. Nudibranchiata.—The Sea Slugs are found on all coasts wliere the bottom is firm or rocky, from between tide-marks to a depth of fifty fathoms. A few .species are pelagic, crawling on the stems and fronds of floating seaweed They have been found in the I
. Cassell's natural history. Animals; Animal behavior. Tritonia, Scyllcea, Tethys, Bormlla, FAMILY , In the genera PhyUidia and Diphyllidla the animal is sht covered by the mantle; the gills form a series on both sides of the body, between the foot and the mantle. They are found in Britain, Norway, and the Red Sea. Division h. Nudibranchiata.—The Sea Slugs are found on all coasts wliere the bottom is firm or rocky, from between tide-marks to a depth of fifty fathoms. A few .species are pelagic, crawling on the stems and fronds of floating seaweed They have been found in the Icy Sea and in the Sea of Okhotsk, whilst in tropical and southern seas they are abundant The animal is destitute of a shell, except in the embryo state ' The branchise are always external on the back and sides. XL.—DORXD-E (SEA-LEMONS). The gills are plume-like, and placed in a circle in the middle of the back. Genera : Doris, Goniodoris, Triopa, .Egirus, Thecacera, Polycera, Idalia, Ancrda, and Ceratosoma. FAMILY XLL—TRXTONIAD^E. The gills in this family are arranged along the sides of tlie back ; tlie tentacles are retractile into sheaths. Genera : Dendronotris, Doto, Melibma, and Lomanctus. FAMILY XLII.—^OLID^. In this family the tentacles have no sheaths and are non-retractile; the gills are placed on the sides. Genera : ^Eolis, GlaiuMs, Fiona, Embletonia, Proctonotus, Antiopa, Hermcea, Alderia. FAMILY XLIII.— These are pelagic footless Sea Slugs, swimming with a fin-like tail. They have two dorsal tentacles and no gills. Genus : Phyllirhoe. FAMILY XLIV.—ELYSIAD^. The animal is Slug-like, without distinct mantle or breathing organs ; the surface of the body is ciliated. Genera : Elysia, Acteonia, Cenia, Limapontia. ORDER IV.—NUCLEOBRANCHIATA. This order is so called because the animals contained in it have the respiratory and digestive organs arranged in a sort of nucleus on the posterior part of the back. All the members are pelagic, swi
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