1892.] MILK-DENTITION OF PROCAVIA CAPENSIS. 49 



15. Huxley, T. H. Manual Vert. Anat. 1871. 



16. . " Evolution and the Arrangement of the Vertebrata." 



P. Z. S. 1880, p. 655. 



17. Krause. Anat. d. Kaninchens. Leipzig, 1884, p. 198. 



18. KtTKENTHAL, W. "Bemerkungen ii. d. Saugetier-Bezahnung." 



Anat. Anz. 1891, pp. 364, 658. 



19. Lataste, F. " S. 1. Systeme Dentaire d. Daman." Ann. Mus. 



Genov. (2) t. iv. (xxiv.) 1886, p. 5. 



20. Milne- Edwards. Mammif. 1868. 



21. . Le9ons s. 1. Physiol, t. 6 (1860). 



22. Marshall & Hurst. Practical Zoology, 2nd ed. 1888. 



23. Owen, R. Corap. Anat. Vert. vol. iii. p. 356 (1868). 



24. . Odontography. 



25. Pallas. Miscell. Zool. 1776, p. 34. 



26. Thomas, O. " Milk-Dentition of Orycteropus." Proc. Roy. 



Soc. vol. xlvii. 1889-90, p. 246. 



27. . " Homologies and succession of Teeth in Basyuridce." 



Phil. Trans, vol. 178. B. 1887, p. 443. 



28. Wagner, A. Schreber's Die Saugethiere, 1844, Bd. 4, p. 307- 



29. Waterhouse. Nat. Hist. Mamm. vol. ii., 1848. 



EXPLANATION OF PLATE II. 



Milk-dentition of Hyrax capensis and Lepus cunicukis. 



?j = nasal. 



IpTHx = premaxilla. 



«t.r= maxilla. 



mcZ= mandible. 



«2S=premaxillo-maxillary suture. 



di'-, di~, di^ — uTpTper deciduous incisors. 



di-^, di.^, dig=lowev deciduous incisors. 



pj^,^i'^= upper permanent incisors. 



jp2^= lower permanent incisor. 



c= upper canine; c-^= lower canine. 



I, II, III, IV=the 4 deciduous premolars. 



t^.^»i=: deciduous premolars. 



m'^ = lst upper molar ; mj = lsfc lower molar, 



cZ=dentine; e=enamel; /=iang; p.c=pulp-cavity. 



Kg. 1. Clarified jaws of a festal Hyrax, showing the teeth in situ, X 4. 



2. Enlarged drawings of the 2nd and 3rd upper incisors {clP, di^) and 



the lower canine (cj of the above, X 50. 



3. Clarified vertical longitudinal section through the premaxilla of a 



Rabbit, showing the relation of the permanent front incisor {pi^) 

 and the deciduous {di^) and permanent {pi^) second incisor. 



4. Clarified jaws of a foetal Eabbit, shortly before birth, to show the 



vestigial milk anterior incisors {di^ and di^. 



5. Enlarged drawing of the vestigial anterior milk-incisors of the 



Babbit, X 100. 



Proc. Zool. Soc— 1892, No. IV. 



