1896.] MAMMAUAN DENTITION 693 



24. Tims. — " Notes oa the Dentition of the Dog." Anat. Anz. 



1896, p. 537. 



25. Tbaubeb. — " Om Tandsaet eg Levernaade hos de danske 



Flagermuiis og Insektaedere." Naturhistorisk Tidskritt, 

 Bd. 8, 1872-73. 



26. WiNGB.— " Om Pattedyrenes Tandskifte isaer med Hensyn tU 



Taendernes Former." Vidensk. Meddel. fra den Naturh. 

 Foren. i Kjobenhavn, 1882, p. 15. 



27. "Woodward, M. F. — " On the Development of the Teeth in 



certain Insectivora." Brit. Assoc. Eeports, 1895, p. 736. 



28. WooDWAUD, M. F. — " On the Development of the Teeth of 



the Macropodidce." Proc. Zool. Soc. 1893, p. 450. 



29. "Woodward, M. F. — " On the Milk Dentition of the Eodentia." 



Anafc. Anz. 1894, p. 619. 



30. "WooDWABD, M. F. — " On the Succession and Genesis of 



Mammalian Teeth." Science Progress, vol. i. 1894, p. 438. 



31. "WoRTMAN. — " Comp. Anat. of the Teeth of the Vertebrata." 



Amer. Syst. Dentistry (Philadelphia, 1886), p. 153, 



32. WoiiTMAN & Osjiohn. — " Mammals of the Lower Miocene 



White Eiver Beds." Bull. Amer, Mus. Nat. Hist. 1894, 

 pp. 197-228. 



EXPLANATION OF PLATJilS XXIII.-XXVI. 



In all cases the teeth represented are from the 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. 



Plate XXIII. 

 Figs. 1-8 a. Erinacetts. 

 Fig. 1. Frontal section of the developing canine, ifo., upper deciduous canine; 

 pc, germ of permanent canine. 

 1 a. Ditto. Older stage. Deciduous canine calcified. 



2. Frontal section of the dereloping 3rd upper incisor, di. 3, vestigial 



milk-incisor ; pi. 3, germ of permanent tooth. 

 2a. Ditto. Older stage. Vestige of di. 3 and neck of the enamel-organ 

 of the functional tooth (pi. 3). 



3. Frontal section of vestigial lower incisor, i. 1. 



4. Germ of 3rd lower incisor {pi. 3). di. 3, probable last trace of deciduous 



tooth. 



5. Developing lower canine (pc.) with its vestigial milk predecessor (dc). 



6. Three sections through the dental lamina between the 2ud and 3rd 



functional 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 lat functional upper premolar (ppm. 2) with vestigial milk 



predecessor (dpm. 2). 



8 a. Germ of dpm. 2 and ppm. 2. 



Plate XXIV. 

 Figs. 9, 9 a. EHnaceus. 

 Fig. 9. Upper jaw of a young Erinaccus, side view. After Leche. 



9 a. Ditto. Palatal aspect of adult. 



