94. A. A. W. HUBREOCHT. 
In fig. 35 the foetal envelope is seen in natural size, and between 
the villi numerous openings (ap.) are detected. In the earlier 
stages these openings are also already present, and can be easily 
seen with a lens or even with the naked eye. If we open the 
chorion enveloping the foetus (fig. 30) we find the inner surface 
of what was the villiferous covering of the foetus to be flat, and 
this inner surface to be only here and there interrupted by round 
patches (R.), each of which corresponds to one of the openings 
(ap.) just meutioned. Of these relations of the parts, figs. 30, 
32, 34, and 386 give further elucidation, whereas the definite 
proof of the correspondence of the flattened and faintly 
prominent recesses (#.) with the apertures (ap.) can of course 
be more especially obtained in sections, as that of fig. 39. 
The distribution of vessels on the inner surface of the chori- 
onic envelope is more particularly visible in fig. 84; the attach- 
ment of the umbilical cord to the same in figs. 32, 33, and 36. 
The villi themselves are at first (fig. 50) more cylindrical ; 
when they increase in age they become folded and wrinkled to a 
not inconsiderable extent, as is visible in figs. 37 and 37a. It 
may be expected that these folds and wrinkles correspond to co- 
ordinated arrangements of the reticular layer of the mucosa, 
the two thus fitting together in a very simple way. 
The maternal folds on the mucosa are in the Madagascar 
lemurs interrupted at regular distances by small bald patches, 
both according to Turner (I. c., figs. 6, 8, and 9) and to Milne 
Edwards (woodcut on p. 280). 
In these spots the tubular uterine glands open out between 
the folds that have arisen on the inner surface of the uterus in 
the course of pregnancy. In Nycticebus I find a more equal 
distribution, the gland openings being found in the centre of 
nearly every separate compartment of the reticular arrange- 
ment. In fig. 38 this is indicated, the darker shading at the 
bottom of these compartments representing gland tracts. 
Viewed with a pocket lens the openings are often visible as 
a whitish spot near the middle, where they appear to be more 
concentrated. 
Figs. 39 and 40, drawn with the camera with very low power, 
