. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. MARSUPIAL1A. 283 the pubis to the ischium on each side of the symphysis, In the Kangaroos, Potoroos, Phalangers, and Opossums the ilia offer an elongated pris- matic form. They are straight in the Opossum, but gently curved outwards in the other Mar- supial genera. In the Dasyure& there is a lon- gitudinal groove widening upwards in place of the angle at the middle of the exterior surface of the ilium. The ilia in the Petaurists are simply compressed, with an almost trenchant anterior margin. They are broader and fla
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. MARSUPIAL1A. 283 the pubis to the ischium on each side of the symphysis, In the Kangaroos, Potoroos, Phalangers, and Opossums the ilia offer an elongated pris- matic form. They are straight in the Opossum, but gently curved outwards in the other Mar- supial genera. In the Dasyure& there is a lon- gitudinal groove widening upwards in place of the angle at the middle of the exterior surface of the ilium. The ilia in the Petaurists are simply compressed, with an almost trenchant anterior margin. They are broader and flatter in the Perameles, and their plane is turned outwards. But the most remarkable form of the ilia is seen in the Wombat, in which they are considerably bent outwards at their anterior extremity. In the Kangaroos and Potoroos the eye is arrested by a strong pro- cess given off from near the middle of the ileo-pubic ridge, and this process may be ob- served less developed in the other Marsupialia. The tuberosity of the ischia inclines outwards in a very slight degree in the Dasyures, Opos- sums, Phalangers, Petaurists, and Perameles, in a greater degree in the Kangaroos and Poto- roos, and gives off a distinct and strong obtuse process in the Wombat, (Jig. 108,) which Fig. 108. The Marsupial bones (a, a, fig. 109) are Fig. Right os innominatum and marsupial bone, Wombat. not only extends outwards but is curved for- wards. In the Potoroos the symphysis of the ischia, or the lower part of what is commonly called the symphysis pubis, is produced ante- riorly. The length of this symphysis, and the straight line formed by the lower margin of the ischia is a characteristic structure of the pelvis in most of the 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 Todd, Robert Bentley, 1809-1860. Lon
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