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Show 1896.] MAMMALIAN DENTITION 593 24. TIMS.-" Notes on the Dentition of the Dog." Anat. Anz. 1896, p. 537. 25. TRAUBER.-"Om Tandsaet og Levernaade hos de danske Plagermuus og Insektaedere." Naturhistorisk Tidskrift, Bd. 8, 1872-73. 26. W I N G E . - " O m Pattedyrenes Tandskifte isaer med Hensyn til Taendernes Pormer." Vidensk. Meddel. fra den Naturh. Foren. i Kjobenhavn, 1882, p. 15. 27. W O O D W A R D , M. P.-" On the Development of the Teeth in certain Insectivora." Brit. Assoc. Reports, 1895, p. 736. 28. W O O D W A R D , M. P.-" On the Development of the Teeth of the Macropodidse." Proc. Zool. Soc. 1893, p. 450. 29. W O O D W A R D , M. P.-" On the Milk Dentition of the Rodentia." Anat. Anz. 1894, p. 619. 30. W O O D W A R D , M. F.-" On the Succession and Genesis of Mammalian Teeth." Science Progress, vol. i. 1894, p. 438. 31. W O E T M A N . - " Comp. Anat. of the Teeth of the Vertebrata." Amer. Syst. Dentistry (Philadelphia, 1886), p. 153. 32. W O R T M A N & OSBORN.-" Mammals of the Lower Miocene White River Beds." Bull. Amer. Mus. Nat. Hist. 1894, pp. 197-228. EXPLANATION OF PLATES 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. P L A T E XXIII. Figs. 1-8 a. Erinaceus. Fig. 1. Frontal section of the developing canine, dc, upper deciduous canine; pc, germ of permanent canine. 1 a. Ditto. Older stage. Deciduous canine calcified. 2. Frontal section of the developing 3rd upper incisor, di. 3, vestigial milk-incisor; pi. 3, germ of permanent tooth. 2 a. 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 2nd 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 1st functional upper premolar (ppm. 2) with vestigial milk predecessor (dpm. 2). 8 a. Germ of dpm. 2 and ppm. 2. PLATE XXIY. Figs. 9, 9 a. Erinaceus. Fig. 9. Upper jaw of a young Erinaceus, side view. After Leche. 9 a. Ditto. Palatal aspect of adult. |