36 RIGHARD ASSHETON AND THOMAS G. STEVENS. 
Fie. 9.—A transverse section through one of the subcircular bodies. ch. 
chorionic surface; a//. allantoic surface; fc. capillaries. x 95. 
Fie. 10.—A piece of the chorionic surface of the above showing minute 
vascular villi; f ¢. capillaries. There is no trophoblast. x 200. 
PLATE 3. 
Fis. 11.—A highly magnified drawing of a small piece of region B to show 
the characters of the syncytial layer (cy.). It is taken near to region C, and 
shows the syncytial layer more distinctly than would a piece nearer to the 
foetal surface. The syncytium is distinctly marked out into cell areas. The 
distribution of the pigment granules is shown, and also the very definite walls 
to the maternal blood-vessels. x 920. 
Fic. 12.—A highly magnified drawing of the terminal portions of fetal 
villi in region C, showing the larger size of the capillaries and the more 
columnar character of the investing epithelium, not here a syncytium. Com- 
pare this with fig. 11. x 920. 
Fic. 13.—A small piece of a maternal blood-channel (from region B), and 
an adjoining fcetal villus vo’. This is to show the leucocytes (/) in the channe} 
crowded with pigment granules. Some near the middle seem to be disin- 
tegrating, or at any rate getting rid of their load of pigment 7’. x 920. 
Fie. 14.—Another piece similar to that of fig. 13, but showing the 
flattening-up against the wal] of these pigment-collecting (?) leucocytes. 
x 920. 
[All the above are from the full-term placenta. Those that follow are from 
Owen’s specimen, namely the half-term placenta. ] 
Fic. 15.—This is a drawing of a section through the whole zonal belt of 
Owen’s specimen. The comparatively small area over which the villi penetrate 
is clearly seen, leaving nearly two-thirds of the maternal surface smooth. 
Note also the bands of non-deciduous villi on either side V, the minute simple 
villi V’’, and the large trunks V’ with their long tufts V”. At pl. the homo- 
geneous material, and at 16 the region of the crowded together terminations 
of the villi abutting upon pl. Nat. size. 
PLATE 4. 
Fic. 16.—A piece just within the homogeneous material layer. It shows 
the ends of fcetal villi covered with well-defined cubical epithelium. Between 
these in some places small pieces of detritus and of the homogeneous layer 
have been enclosed. x 300. 
Fic. 17.—An apex of one of the villi abutting against the homogeneous 
layer. ‘The cells of the trophoblast seem to be passing out into the plasmodium 
when they lose their affinity for staining and appear to die. x 400. 
