482 J. T. WILSON AND J. P. HILL. 
of preparation for the formation of a dermal papilla. It forms 
a shallower Anlage than 7, besides being placed at a higher 
level. 
In one or two sections we find close under the oral epithe- 
lium, and placed in the angle between the latter and the labial 
side of the enamel-organ of iz, a somewhat flattened mass of 
epithelial cells surrounded by condensed connective tissue. 
This appears to represent a rudimentary diz. In the follow- 
ing stages its form and relations become still more manifest, 
though it never undergoes calcification. It does not appear in 
the section shown in fig. 34. 
No such rudiment is observable in connection with 73. 
Behind 7,, the dental lamina, which is there considerably 
displaced outwards from the mesial plane, now bends slightly 
inwards again (cf. fig. 36), and becomes markedly reduced in 
height. After continuing for a short distance as an extremely 
shallow and insignificant structure, its cross-section rather 
suddenly undergoes marked elongation, penetrating further 
and further into the surrounding connective tissue, not verti- 
cally but rather mesially, in a direction almost parallel with 
the deep surface of the oral epithelium. At the same time it 
swells out markedly at its free distal margin or fundus, and at 
its point of maximum development exhibits some flattening, or 
even slight depression, towards its labial side (fig. 37). There 
is present also just the faintest trace of the differentiation of 
the connective tissue foreshadowing the growth of the dermal 
papilla, though as yet there is no papillary projection what- 
ever in this situation. The proximal or attached portion of 
the lamina (or “ neck ”’) is elongated and mueh constricted, 
and is pretty closely appressed to the deep surface of the oral 
epithelium. Close to its point of continuity with the latter is 
attached the small but deeply cupped enamel-organ of de. (fig. 
37), which has been figured in its earlier stage of differentia- 
tion in Stage 11 (fig. 13). 
The superficial resemblance between fig. 34, showing rela- 
tion of i; to zz, and fig. 87 showing the relation of d; to; is 
somewhat striking; but, as has been pointed out, the funda- 
