588 Ji Di! WILSON: AND! J: P. HELE. 
Fie. 70.—(Stace IX.) U.S, C0. 8. m&. x 120. 
Fig. 71.—(Stacre X.) U. J, C. S. Enamel-organ of m® with residual 
dental lamina, surrounded by concentrically arranged connective tissue. x 80. 
Fie. 72.—(Stace X.) U.J., C. 8. Passing through £, showing one of the 
enlargements of the residual dental lamina surrounded by a connective-tissue 
capsule. x 230. 
Fic. 73.—(Stace X.) U.J., C. S. Hnamel-germ of p&. x 120. 
Fic. 74.—(Stace XIII.) U.J.,C. 8. Enamel-organ of pz, with com- 
mencing formation of a residual dental lamina. x 90. 
Fic. 75.—(Stace XIII.) U.J. From below. x 23. 
Figs. 76 and 77.—Coronal sections through the third premolars (lower and 
upper) of Phascolarctus cinereus, showing residual dental lamine by 
the sides of p2. S/’. Residual dental lamina by side of pz. x 30. 
(After Leche, Taf. xvi, figs. 140 and 142.) 
Fic. 78.—(Stace XIV.) U.J. Region of premolars and molars from 
below. xX 33. 
Fie. 79.—(Stace XIV.) JZ. J. Region of premolars and molars from 
above. X 33. 
Fie. 80.—Dasyurus viverrinus. ZL. J., C.S. dpz. X 180. 
Fic. 81.—Dasyurus viverrinus, JZ. J.C. 8. dpz in an older fetus. 
x 1380. 
Fic. 82.—(Stace V.) JU. J. Combination-drawing from several hori- 
zontal sections. x 55. 
Fic. 83.—U. J. Pig embryo of 20 mm. head-length. @C. 8. Dental lamina 
in posterior molar region (see text). X 75. 
Fic. 84.—Z. J. Pig embryo of 20 mm. head-length. C. 8. Passing just 
posterior to ¢z, showing labial laminar outgrowth (/. 0.) and lip-groove 
(1. gr.). xX 30. 
Fic. $5.—Z. J. Pig embryo of 20 mm. head-length. C. 8. passing through 
iz, showing labial laminar outgrowth (/. 0.) and lip-groove (/. gr.). x 30. 
