660 J. T. PATTERSON 
ore 
BSaa| 
Bipety 
Afar) 
ass marth, 
_ A penBtS 
pep? 
Fig. 32 A portion of the left side of the section shown in figure 51. X 306. 
Fig. 33 A similar region from the section shown in figure 58. D.C., cells in 
mitosis; G.C., giant cell, which is frequently found at the base of the blastocyst 
At mis the beginning of a mass of Triiger cells which later extends up to receive the 
entoderm. X 306. 
Fig. 34 A portion of the left side of the section shown in figure 60. The mass 
at m now carries the entoderm, while the outer layer of Triiger cells is seen as the 
basal fragment (b.f.). Note that the vacuoles are beginning to appear in the 
syncytium. X 319. 
Fig. 35 A portion of the right side of a section from specimen No. 175, 
plate 8. The Triiger epithelium (7’r.Ep.) is quite well organized, and root-like 
growths of Trager tissue are seen extending into the mucosa at Hm. X 485. 
