. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 292 On a neio Tijpi of E-iptUian ToolJi. external wall of dentine is now seen to thicken at the expense of the pulp-cavitj, which has lost its five-rayed form and become more L-shaped. The inn^r wall of the canal E appears to be broken, but th? inner walls of the other canals have thickened, especially on the external side of the tooth (fi^. 2). , The distal fracture of the tooth is much more recent and shows the pulp-cavity reduced to a curved hamate form situate towards the
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 292 On a neio Tijpi of E-iptUian ToolJi. external wall of dentine is now seen to thicken at the expense of the pulp-cavitj, which has lost its five-rayed form and become more L-shaped. The inn^r wall of the canal E appears to be broken, but th? inner walls of the other canals have thickened, especially on the external side of the tooth (fi^. 2). , The distal fracture of the tooth is much more recent and shows the pulp-cavity reduced to a curved hamate form situate towards the inner side of the tooth and only two tenths of an inch wide in the middle. The inlet E is imperfectly separated from the pulp-cavity, probably from the effdct of strain, though the partition of dentine bc;tween them remains as thin as in the basal section (fig. 1). The inlet D retains its comma- or flask-shaped form without decrease in sizi. The inlets C and B are almost entirely closed by the approxi- mation of the lateral external walls (fig. 3). The tooth- substance in which they are contained is fully half an inch thick, but on the inner side of the tooth the walls of dentine are only from one to two tenths of an inch thick. Fin;. Distal fracture of the tootli. These inlets have been regarded by Dr. Kannemeyer as comparable to the poison-duct in the tooth of a venomous serpent. The inlet D is essentially of this character, and although th« entire tooth is to be desired before the inference can be regarded as established, it is not improbable that all the canals may be outlets for poison-glands. Externally'the five bars of the tooth are vertically ribbed with six to ten slightly elevated, blunt, parallel, linear stripes, which are stronger on the outer than on the inner side. There is a very slightly elevated girdling ridge, situate below. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorat
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Keywords: ., bookce, booksubjectbotany, booksubjectgeology, booksubjectzoology
