. Natural history. Geology; Zoology; Botany. Fig. 3. Tritoniella belli—Antebior Pabt op Back in three specimens showing the vabying ARBANGBMENT OP TUBBBCLES. sheaths are directed either laterally or vertically, and their margins are generally turned outwards. The body-walls are thick, the dorsal integuments much thicker posteriorly than in the centre of the back. The body cavity is only about 30 mm. long, the solid tail measuring 18*5 mm. The pericardium is not visible externally, and lies somewhat to the right of the median dorsal line. The central nervous system is as in Tritonia, but no eye
. Natural history. Geology; Zoology; Botany. Fig. 3. Tritoniella belli—Antebior Pabt op Back in three specimens showing the vabying ARBANGBMENT OP TUBBBCLES. sheaths are directed either laterally or vertically, and their margins are generally turned outwards. The body-walls are thick, the dorsal integuments much thicker posteriorly than in the centre of the back. The body cavity is only about 30 mm. long, the solid tail measuring 18*5 mm. The pericardium is not visible externally, and lies somewhat to the right of the median dorsal line. The central nervous system is as in Tritonia, but no eyes were discovered. The ganglia are very distinctly granulate and yellowish. The pedal ganglia are round, the cerebro-pleural larger, but without any sign of a division into two parts. The elongate, elliptical buccal ganglia are applied closely to the under side of the oesophagus at some distance from one another, and the small round gastro-oesophageal ganglia are united to them by long connectives. The buccal mass is of the Tritonia type, and presents no important differences in any of the specimens. The jaws are strong (Fig. 5), very convex, and present a roughly circular appearance (with a diameter of about 7-5 mm.) as they lie 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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