903 



" (e.) Fig. 16. A cuspidatus, showing the same circumstance." 



" (</.) Fig. 15. A lateral view of the enamel of a bicuspis cut longitudinally." 



" (e.) A similar view of the enamel of a molaris." 



" (/.) Fig. 14. Another view of the enamel of a molaris." 



" (^.). Fig. 12. The basis of a molaris whose points were worn down, and the bony part 

 which projected into those points exposed." 



" (A.) Fig. 13. A molaris, whose bony part is wholly exposed, and only a circle of enamel 

 left, covering the sides all round." 



" ('.) Fig. 20. The grinding surface of a Horse's molaris, to show the irregular course of 

 the enamel." 



(/.) A section of one of the denticuli of an Asiatic Elephant's molar, showing the dentine, 

 enamel and cement. Only a very small proportion of the dentine or ' bony part ' appears in 

 this section : it is enclosed in the enamel. 



(k.) A horizontal section of the molaris of a Horse, to show the course of the enamel. 

 Both the dentine and cement are blackened by the action of fire. 



5859. (Slide 4.) A series of Teeth in longitudinal section, to show the size and shape 

 of their pulp-cavities. 



Three are canines, two bicuspids, and two molars. There are also two transverse sections 

 of fangs, the crown of a molar not fully developed, and an upper molar with a large concre- 

 tion of tartar attached to it. 



5860. (Slide 5.) Longitudinal and transverse sections of Human permanent teeth. 



a. a. The incisors. 



b. The canine. 



c. A premolar or bicuspid, showing, by the double pulp-cavity, that the apparently single 

 fang consists of two connate fangs. 



c*. A premolar, in which the two fangs are distinct at the lower half of the root. 



d. A molar, showing, by the double pulp-cavity of one of its apparently single fangs, that 

 this consists of two connate fangs. (The above are the subjects of figs. 1-5 of pi. xiv. Op. cit.) 



e. A molar, with the pulp- cavity exposed in the crown, and one of the fangs broken away. 



f. A molar, showing the divisions of the pulp-cavity continued into the diverging fangs. 



g. A transverse section of the crown of a molar, showing the part of the pulp-cavity next 

 the grinding surface. 



h . A transverse section of the crown of a molar, showing the part of the pulp-cavity next 

 the fangs. (The two preceding specimens are the subjects of figs. 8 & 9, pi. xiv. Op. eit.) 



i. This specimen is the subject of fig. 7. pi. xiv., where it is thus described : " A molaris 

 of the lower-jaw, with part of its fangs sawed off, to show that the sides of the cavity or 

 canal have grown together, and divided it into two small canals, which are represented by 

 two dark points." In other words, the two seemingly single fangs consist each of two con- 

 nate fangs. 



