THE DENTAL TISSUES OF THE ORDER RODENTIA. 
567 
Fig. 45. 
Fig. 46. 
Fig. 47. 
Fig. 48. 
Fig. 49. 
Fig. 50. 
Fig. 51. 
Fig. 52. 
Fig. 53. 
A transverse section from an upj3er incisor of the Capybara {llydrochcerus 
Capyhara), showing, D, the dentine, and E, the enamel. 150 linear. 
A longitudinal section from the same tooth, showing the peripheral layer of 
cells, D, and E, the enamel with the penniform character of the confluent 
lamellse. 150 linear. 
A longitudinal section from an upper incisor of Brathyergus rnaritimus, 
showing, D, the dentine, and E, the enamel with its peculiar Hystricine 
enamel laminae, and the large amount of the external division of the tissue. 
150 linear. 
A longitudinal section of a molar of Pedetes Cafer, showing, D, the dentine, 
and E, the enamel, with the inner portion fibrous, and the outer lamelli- 
form. 
A transverse section from the same tooth ; D, the dentine, and E, the enamel. 
A longitudinal section from a lower incisor of the Hare {Lepiis timidus), 
showing, D, the dentine, and E, the enamel fibres, without a lamelli- 
form arrangement, and without a division into an external and internal 
portion. 200 linear. 
A vascular canal surrounded by a layer of non-tubular tissue, as seen in a 
longitudinal section of an incisor of the Hare. 300 linear. 
A transverse section from a molar of the Hare {Lepus timidus), showing, H, 
the dentine with its large tubes, and E, the enamel with the fibres in the 
inner portion parallel, and in the outer curved and irregularly Hystricine. 
200 linear. 
A longitudinal section from a molar of Lepus Americanus, showing the irre- 
gular lamelliform character of the outer portion of the enamel. 200 linear. 
