. Discovery reports. Discovery (Ship); Scientific expeditions. 246 DISCOVERY REPORTS adopt Ridewood's orientation, so that in the following account the long axis of the body is regarded as longitudinal (Fig. 5). The internal anatomy of Cephalodisciis has been worked out very thoroughly by Harmer (1905) and Andersson (1907). From sections of the zooids of different species TRANSVERSE. Fig. 5. Orientation of the zooid. a, proboscis; b, central nervous system; c, gonad; d, notochord; c, post-oral lamella; /, stomach; g, intestine; /?, pharynx; ?', stolon; j, heart and pericardium. of the present
. Discovery reports. Discovery (Ship); Scientific expeditions. 246 DISCOVERY REPORTS adopt Ridewood's orientation, so that in the following account the long axis of the body is regarded as longitudinal (Fig. 5). The internal anatomy of Cephalodisciis has been worked out very thoroughly by Harmer (1905) and Andersson (1907). From sections of the zooids of different species TRANSVERSE. Fig. 5. Orientation of the zooid. a, proboscis; b, central nervous system; c, gonad; d, notochord; c, post-oral lamella; /, stomach; g, intestine; /?, pharynx; ?', stolon; j, heart and pericardium. of the present collection it has been possible to verify these results. The following account does not attempt to give a complete description of all parts, but only deals with those organs and systems about which new observations have been made. PROBOSCIS The proboscis of Cephalodisciis varies in size and shape, as will have been seen in the systematic accounts. The discoidal part of the proboscis is attached to the body by a very short neck, which is always capable of a little extension. That this gives the disc great mobility is clear from the diverse positions of the proboscis in the preserved individuals. Observations made on the living zooids show that they come out of the coenoecium and creep on the surface of the colony, with the disc acting as a sucker. This was first recorded by Andersson (1907, p. 59) and confirmed by the observations of Dr Stanley Kemp during the present expedition. The disc is flattened 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 Institute of Oceanographic Sciences (Great Britain); National Institute of Oceanography; Great Britain. Colonial Office. "Discovery" Committee. London, New York, Cambridge University Press
Size: 1308px × 1909px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectscientificexpedition
