. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. THE DENTITION OF THE TITANOSUCHIAN DINOCEPHALIANS 85 2. Lying 9 mm. deeper this section shows replacement No. 2 lying in its pocket, a cavity housed the replacement of No. 3 and cavity No. 4 is empty. Lingually of the functional canine root lies a pocket housing the replacing canine. 3. Here an empty cavity for replacement of No. 1 is seen and a replacement of the third postcanine. A! r Jb^^: 1' '" ?v »"~~- > Proc «^^. Fig. 22. Jonkeria truculenta. 12030. X \. Inner face
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. THE DENTITION OF THE TITANOSUCHIAN DINOCEPHALIANS 85 2. Lying 9 mm. deeper this section shows replacement No. 2 lying in its pocket, a cavity housed the replacement of No. 3 and cavity No. 4 is empty. Lingually of the functional canine root lies a pocket housing the replacing canine. 3. Here an empty cavity for replacement of No. 1 is seen and a replacement of the third postcanine. A! r Jb^^: 1' '" ?v »"~~- > Proc «^^. Fig. 22. Jonkeria truculenta. 12030. X \. Inner face of left mandible. Canines The left upper canine is beautifully preserved. The crown length is 90 mm. and at its base its diameters are 42 and 29 mm. It is thus a long, moderately strong tooth and has only a moderate posterior curvature; its posterior face is rounded with no indication of a cutting edge. The right upper canine has diameters of 50 and 24 mm. A small pocket for the left replacing canine lies linguo-posteriorly of the functional canine. The left lower canine is fairly well preserved; its length is 41 mm. and its basal diameters are 24 and 31 mm. It is thus quite a moderately sized tooth. It is directed both forwards and outwards. Just behind its tip there is an oval hole which is a result of resorption of the dentine. Its antero-dorsal face is excavated to form a heel bearing some similarity to that typical of the incisors. The fifth upper incisor fits with the postero-external part of its heel into this heel of the lower canine. The mode of intermeshing is thus as is typical of the incisors. Lingually of the canine base there is the usual notch in the flange of the dentary for the replacing canine. In the right dentary, sectioning shows a canine root with diameters 30 X 20 mm. and a pocket containing the tip of the replacing Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - color
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
