. Narrative of the surveying voyage of Fly : commanded by Captain Blackwood, , in Torres Strait, New Guinea, and other islands of the Eastern Archipelago, during the year 1842-1846 ; together with an excursion into the interior of the eastern part of Java. Fig. 4.—Skull of Indian Dugong, 328 APPENDIX. The deflected symphysis of the lower jaw is also longerin proportion to its antero-posterior extent in Halicoreaustralis (fig. 3). There are some minor differences in thecranium; but the general structure and configuration ofthis part of the skeleton is closely similar in both spe
. Narrative of the surveying voyage of Fly : commanded by Captain Blackwood, , in Torres Strait, New Guinea, and other islands of the Eastern Archipelago, during the year 1842-1846 ; together with an excursion into the interior of the eastern part of Java. Fig. 4.—Skull of Indian Dugong, 328 APPENDIX. The deflected symphysis of the lower jaw is also longerin proportion to its antero-posterior extent in Halicoreaustralis (fig. 3). There are some minor differences in thecranium; but the general structure and configuration ofthis part of the skeleton is closely similar in both species. With regard to the rest of the skeleton, the scapula(fig. 5) best exemplifies the specific distinction of theHalicore Fig. 5.—Blade Bone, Australian Dugong. Fig. 6.—Blade Bone, Indian Dugong. This is seen in the minor breadth as compared with thelength of the bone, arising chiefly from the straighteranterior costa, which in Halicore indicus (fig. 6) describesa bold convexity; and this character is as well manifestedin the young Indian Dugong, whose skeleton is figured in APPENDIX. 329 the Philosophical Transactions/ 1821, plate XX, as it isin the largest and oldest individuals. The neck of thescapula is relatively longer, and the coracoid process rela-tively broader and shorter in the Halicore australis thanin the Halicore indicus. The lower jaw of the younger specimen of HalicoreAustralis shews, by the superior size and depth of thethird incisive alveolus, counting from below upward, ineach ramus, that the rudimental incisors were present inthose sockets, where they have been commonly found inthe Halicore indicus. In the lower jaw of the olderspecimen of Hal. australis these sockets were filled
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