Transactions and proceedings and report of the Philosophical Society of Adelaide, South Australia . Fig. 6. Rhinarium embryo 100 mm.(Specimen female B, PerthMuseum). 367 continuation of the middle line sulcus. The naked area is afine pink colour, and the surface has a finely-granulatedtexture. The narial slits are bounded above by naked skinfor the whole of their length, but the inferior margins arepubescent a short distance from their anterior ends. Theinfra-narial portion of the rhinarium is marked by a mediansulcus, and is continued to the free margin of the upperlip, narrowing rapidly as i
Transactions and proceedings and report of the Philosophical Society of Adelaide, South Australia . Fig. 6. Rhinarium embryo 100 mm.(Specimen female B, PerthMuseum). 367 continuation of the middle line sulcus. The naked area is afine pink colour, and the surface has a finely-granulatedtexture. The narial slits are bounded above by naked skinfor the whole of their length, but the inferior margins arepubescent a short distance from their anterior ends. Theinfra-narial portion of the rhinarium is marked by a mediansulcus, and is continued to the free margin of the upperlip, narrowing rapidly as it approaches the lip. The hair onthe supra-narial margin is directed towards the distal end. C D Fig. 7. The form of the external , 32 mm. B, 65 mm. C, 80 mm. D, 100 mm. embryos. of the rhinarium, whilst on the infra-narial margin the hairdirection is reversed. The External Ear (see figs. 7 and 8).—In the 32 (see fig. 7, A) the auricle is folded with the free tipdirected forwards, and the whole pinna is tightly adpressedto the side of the head. In the 45 mm. stage it is foldedwith the free tip directed backwards, and again the pinnais closely applied to the head. At 65 mm. (see fig. 7, B) theenlarging auricle is not so closely applied to the head, andat 80 mm. (see fig. 7, C) it projects from the side of thehead, the direction of folding being now variable. In olderexamples the free auricle usually has its tip folded forwards 368 again. As soon as the auricle is folded backwards the crushelicis becomes a prominent feature, and after rising verticallyupwards it takes a sudden turn backwards at right angles toits former direction. This right-angled bend is remov
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1878
