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| 文件类型： | 文章 |
|---|---|
| 所有的著者/提供者： | Sumner A Dow (Jr.); Philip L Wright |
| ISSN: | 0022-541X |
| OCLC号码： | 479863917 |
| 语言注释： | English |
| 注意： | Fig. 1. A-G, natural size; H-N, 5/6 natural size. A. Incisiform teeth of typical 1/3-year-old hunter-killed fawn showing all slightly worn deciduous teeth. B. Incisiform teeth of typical 1 1/3-year-old hunter-killed animal. The tips of Di2 have become broken in handling. C. Incisiform teeth of 1 1/3-year-old hunter-killed animal in which all of the deciduous incisiform teeth are still present but extensively worn and widely spaced. About 15 per cent of yearling antelope as killed during the hunting season are in this state. D. Incisiform teeth of 2 1/3-year-old hunter-killed animal. About two-thirds of the hunter-killed animals are in this condition with the incisiform teeth, Pi1, Pi2, and Di3, and Dc1. E. Incisiform teeth of hunter-killed animal estimated to be 3 1/3 years old showing only Dc1 not yet replaced. The tips of Pi1 and Pi2 show considerable wear. F. Incisiform teeth of animal estimated to be 4 1/3 years old. Almost 80 per cent of animals classified in this class have the full set of permanent incisiform teeth. G. Incisiform teeth of animal classified in the 6-plus age class. All teeth show heavy wear at this stage. H. Jaw of 44-day-old animal (K-1). I. Jaw of 67-day-old animal (K-7). J. Jaw of 110-day-old animal (K-3). K. Jaw of 180-day-old animal (K-4). L. Jaw of established-age 8-month-old animal (E-8). M. Jaw of established-age 12-month-old animal (E-9). N. Jaw of established-age 1 1/3-year-old animal (E-11). Fig. 2. Diagrams of typical deciduous premolar and a typical molar of pronghorn antelope. Fig. 3. Radiograms of typical stages of antelope jaws. All about 3/5 × natural size. A. Jaw of 44-day-old animal (K-1). The rooted deciduous premolars show distinctly. m1 is well formed although additional ossification is occurring at the base of the tooth. The central enamel in the rear cusp is visible extending downward through about two-thirds of the crown. m2 is partially formed within the jaw. B. Jaw of 180-day-old animal. The deciduous premolars are continuing to erupt. m1 has been further lengthened by additional ossification. m2 is now partially erupted and m3 is just beginning to form. C. Jaw of 1 1/3-year-old animal (E-13). The permanent premolars are beginning to form in the jaw and result in some dissolution of the roots of the deciduous premolars. m1, m2, and m3 continue to increase in length and now extend almost completely through the jaw. D. Jaw of 1 2/3-year-old animal (E-14) to show further developing permanent premolars encroaching on the roots of the deciduous premolars. E. Jaw of 2 1/3-year-old animal (E-16) showing eruption of the permanent premolars. F. Jaw of 3 1/3-year-old animal (E-18). All teeth are now almost fully formed yet distinct roots are visible only on Pp3. In only Pp4 and m1 have the bases of the teeth begun to move away from the lower edge of the jaw. G. Jaw of 4 1/3-year-old animal (E-20). All of the teeth are erupting further but especially m1, as the occlusal surfaces become worn. H. Jaw of 5 1/3-year-old animal (E-22). I. Jaw of 6 1/3-year-old animal (E-23). Note small area of central enamel surrounding central infundibulum on m3. J. Jaw of 6-plus animal in which no infundibula remain. This animal is probably 9 or more years old. Fig. 4. Molariform teeth of established-age animals ranging from 2 1/3 years to 6 1/3 years old. All about 1½ × natural size. A. Jaw of 2 1/3-year-old animal (E-16) showing permanent premolars in process of eruption and molars with all infundibula present. B. Jaw of 3 1/3-year-old animal (E-18) showing full set of permanent teeth with all 12 infundibula clearly visible. C. Jaw of 4 1/3-year-old animal (E-20) showing m1 with wear such that both infundibula are gone as well as the rear one from m3. D. Jaw of 5 1/3-year-old animal (E-22). The rear cusp of m3 has been shot away but in the corresponding tooth on the right jaw the infundibulum is gone. The rear infundibulum on Pp4, both on m1, and the anterior one on m2 have all disappeared. E. Jaw of 6 1/3-year-old animal (E-23) showing only 5 of the original 12 infundibula still remaining. |
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