584, J. T. WILSON AND J. P. HILL. 
35. Husrecut.— Die Phylogenese des Amnions und die Bedeutung des 
Trophoblastes,” ‘Verhand. der K. Akad. v. Wetenschappen te 
Amsterdam,’ Tweede Sectie Dl. iv, n. 5, 1895. 
36. GecenBAUR.—‘ Bemerkungen iiber die Milchdriisen-papillen der Sauge- 
tiere,” ‘ Jenaische Zeitschr.,’ Bd. vii, 1873. ‘Zur genaueren Kenntniss 
der Zitzen der Saugetiere,” ‘Morph. Jahrb.,’ Bd. i, 1876. ‘ Zur 
Kenntniss der Mammarorgane der Monotremen,’ Leipzig, 1886. 
37. Maret? Tims.—‘ Notes on the Dentition of the Dog,” ‘Anat. Anz., 
Bd. xi, 1896. 
EXPLANATION OF PLATES 25—82, 
Illustrating Messrs. J. T. Wilson’s and J. P. Hill’s paper, 
“Observations upon the Development and Succession of 
the Teeth in Perameles ; together with a Contribution to 
the Discussion of the Homologies of the Teeth in Mar- 
supial Animals.” 
All sections drawn were outlined by means of Zeiss’s camera lucida. 
List oF Common REFERENCE LETTERS. 
C. S. Coronal Section. H.§. Horizontal Section. %. S. Sagittal Section. 
U. J. Upper Jaw. LZ. J. Lower Jaw. 
cb. Connecting bridge. d/. Dental lamina. mp. Dermal papilla. dl. 
Residual dental lamina. cm. Meckel’s cartilage. 7%. 0. Labial laminar out- 
growth. o.¢. Oralepithelium. ¢. Tongue. 7, *, p?, &c. First upper incisor, 
upper canine, second upper premolar, &. 73, z pg, &e. Second lower incisor, 
lower canine, third lower premolar, &c. diz, d*, dp, &e. First lower milk 
incisor, upper milk canine, third upper milk premolar, &c. 
The lingual side of the figure of each coronal and horizontal section is 
indicated by a cross. 
Stace II. 
Fics. 1—5.—Serial coronal sections, U. J. 
Fig. 1. In front of third incisor region. 
Figs. 2 and 3. Next succeeding sections through enamel-organ of di3, 
attached to “neck” of dental lamina, and showing earliest formation 
of dermal papilla. 
