. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. TEGUMENTS OF REPTILES. 551 367 a lamellate structure, fig. 368, g, like that of Fishes, but with the direction of the fibres, in succeeding layers, more regularly alter- nating. In most parts of the trunk of the Anoura the skin is separated by wide lymphatic lacuna;, fig. 367, P, from the subcuta- neous fascia, ib. E. Marsupial pouches, one for each larva, ib. B, c, are temporarilydeveloped in the skin of the back of the fe- male Pipa : a common dorsal pouch for eggs and larvre is present in the female Noto- trema viarsu
. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. TEGUMENTS OF REPTILES. 551 367 a lamellate structure, fig. 368, g, like that of Fishes, but with the direction of the fibres, in succeeding layers, more regularly alter- nating. In most parts of the trunk of the Anoura the skin is separated by wide lymphatic lacuna;, fig. 367, P, from the subcuta- neous fascia, ib. E. Marsupial pouches, one for each larva, ib. B, c, are temporarilydeveloped in the skin of the back of the fe- male Pipa : a common dorsal pouch for eggs and larvre is present in the female Noto- trema viarsupiatuin, Gnth., and in Opisthodelphys. Tlie epiderm in Perennibranchi- ates resembles that of mu- iiEnoid Fishes: in most A- noura the constituent nucle- ate cells are more condensed, fig. 368, h : in many Toads the epiderm is tuberculate; rarely are scales, and scutes never, present in the exist- ing Hatrachia. In Cacilia the skin is ringed by trans- verse rugte. In the Ameri- can Newts, of the genus Plestiodon, the small scales present a reticulate struc- ture. In Bufo tuberosus the ejiiderm forms on the dorsal tuber- cles a horny spine in the centre, surrounded by a ring of smaller sj^ines: Bufo asp)er has conical spine-bearing tubercles on the back and sides of the trunk : those on the upper eye- lids of certain Toads have earned for them the generic name Ceratiphrys (jRana cornuta, Linn.). In 8alamandra unguiculata, and in Dactylethra among the Toads, the epidei'm is condensed into a claw at the end of some of the digits : in D. Midleri it also forms a spur at the base of the first hind-toe. In Pipa the skin is produced at the end of each fore-toe into a 3- or 4-forked appendage, fig. 367. As a rule, the Batrachia are without claws. Pigment-cells, fig. 368, a, are developed in various degrees, and of diverse shades of colour, commonly of a dull and neutral or mixed tint, but giving to parts of the skin of the land Salamander a yellow or orange hue, and painting the surface
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