. Natural history. Geology; Zoology; Botany. 16 W. G. KIDEWOOD. The red liDe of the shield which is so conspicuous and constant a feature of Cephalodiscus does not seem to be present in Rhabdopleura. Schepotieff shows, in the exact position occupied by the red line in Cephalodiscus, a " Pigmentstreif " (1904, pi. 2, fig. 9, and 1905, p. 796, fig. l), but since he says nothing about red colour, one is led to conclude that the pigment-stripe is black. The crowd of black pigment spots at the anterior point of the shield of Rhabdopleura, assumed to be a rudimentary organ of vision, finds
. Natural history. Geology; Zoology; Botany. 16 W. G. KIDEWOOD. The red liDe of the shield which is so conspicuous and constant a feature of Cephalodiscus does not seem to be present in Rhabdopleura. Schepotieff shows, in the exact position occupied by the red line in Cephalodiscus, a " Pigmentstreif " (1904, pi. 2, fig. 9, and 1905, p. 796, fig. l), but since he says nothing about red colour, one is led to conclude that the pigment-stripe is black. The crowd of black pigment spots at the anterior point of the shield of Rhabdopleura, assumed to be a rudimentary organ of vision, finds no equivalent in Cephalodiscus. The relations of the shield to the mouth, however, and the great mobility of the shield, and the glandular nature of. Text-Figure 8.~Rhabdopletira •normani, a polypide greatly enlarged. (Copied from Lankester, 13, plate 38, fig. 1.) a, mouth; 6, anus ; c, polypide stalk; d, buccal shield; e, plume; /, visceral mass. the thick central part of the ventral wall of the shield (Schepotieff, 1905), are the same in both Rhabdopleura and Cephalodiscus. The collar region is produced in both into a postoral lamella and plumes. The latter are two in number in Rhabdopleura, and although Cephalodiscus has in most cases four pairs or more, Harmer's discovery of male polypides of C. sibogae with one pair of plumes only (10, p. 84) is of interest in this connection, in spite of the fact that such plumes do not possess Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original National Antarctic Expedition, 1907-1904; Fletcher, Lazarus, Sir 1854-1921; Bell, F. J. (Francis Jeffrey), 1855-1924; British Museum (Natural History). London, Printed by order of the Trustees of the British Museum
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