1896.] MAMMALIAN DENTITION 593 
24. Trms.—‘‘ Notes on the Dentition of the Dog.” Anat. Anz. 
1896, p. 537. 
25. TrauBer.—‘Om Tandsaet og Levernaade hos de danske 
Flagermuus og Insektaedere.” Naturhistorisk Tidskrift, 
Bd. 8, 1872-73. 
26. Wincz.—* Om Pattedyrenes Tandskifte isaer med Hensyn til 
Taendernes Former.” Vidensk. Meddel. fra den Naturh. 
Foren. i Kjébenhavn, 1882, p. 15. 
27. Woopwarp, M. F.—“‘ On the Development of the Teeth in 
certain Insectivora.” Brit. Assoc. Reports, 1895, p. 736. 
28. Woopwarp, M. F.—‘ On the Development of the Teeth of 
the Macropodide.” Proc. Zool. Soc. 1893, p. 450. 
29. Woopwarp, M. F.—“ On the Milk Dentition of the Rodentia.” 
Anat. Anz. 1894, p. 619. 
30. Woopwarp, M. F.—On the Succession and Genesis of 
Mammalian Teeth.” Science Progress, vol. i. 1894, p. 438. 
31. Worrman.—‘ Comp. Anat. of the Teeth of the Vertebrata.” 
Amer. Syst. Dentistry (Philadelphia, 1886), p. 153. 
32. Worrman & Oszorn.— Mammals of the Lower Miocene 
White River Beds.” Bull. Amer. Mus. Nat. Hist. 1894, 
pp. 197-228. 
EXPLANATION OF PLATES XXITI.-XXVI. 
In all cases the teeth represented are from ihe left side, and when shown in 
section the anterior surface is represented, so that the left side of the Plate 
represents the lingual and the right the labial side of the jaw. 
Puate XXIII. 
Figs. 1-8 a. Hrinaceus. 
Fig. 1. Frontal section of the developing canine. dc., upper deciduous canine ; 
pe., germ of permanent canine. sir 
la. Ditto. Older stage. Deciduous canine calcified. 
2. Frontal section of the developing 8rd upper incisor. di. 3, vestigial 
milk-incisor; pi.3, germ of permanent tooth. iver 
Qa. Ditto. Older stage. Vestige of di. 3 and neck of the enamel-organ 
of the functional tooth (pz. 3). rae 
. Frontal section of vestigial lower incisor, 7. 1. 
. Germ nf 3rd lower incisor (pi.3). di. 3, probable last trace of deciduous 
tooth. 
. Developing lower canine (pe.) with its vestigial milk predecessor (de.). 
. Three sections through the dental lamina between the 2nd and 3rd 
oo upper premolars. (These should incline from left to 
right. 
7. Ditto between the two lower premolars; pm. 3, germ of missing premolar. 
8. Germ of Ist functional upper premolar (ppm.2) with vestigial milk 
predecessor (dpm. 2). 
8a. Germ of dpm. 2 and ppm. 2. 
> Or wm CO 
Puate XXIV. 
Figs. 9,94. Hrinaceus. 
Fig. 9. Upper jaw of a young Hrinaceus, side view. After Leche. 
9a. Ditto. Palatal aspect of adult. 
