132 A. A. W. HUBRECHT. 
here bent to the left has been removed from the subjacent villiferous chorion 
without any effort of traction. 
Utr. Mus. Cat. n° Nycticebus 84. 
Fic. 32.—A similar stage of the same specimen, but in which not only the 
uterine wall but also the foetal envelopes have been opened and have also 
been folded back. Embryo removed. 
Utr. Mus. Cat. n° Nycticebus 45. 
Fie. 33.—A ring-shaped section of a Nycticebus uterus, nearly at full term. 
The embryo alone has been removed. The umbilical cord is seen to divide 
into a number of vasiferous strands, attached to the inner surface of the 
chorion. The fcetal envelopes (with-the exception of the amnion, which has 
been removed with the fcetus) have been left in their natural position. 
Utr. Mus. Cat. n° Nycticebus 41. 
Fie, 34.—The inner surface of the chorion enlarged three times, showing 
finely ramifying blood-vessels, both afferent and efferent, the two of different 
colour in the preserved specimens. Chorionic recesses (cf. Figs. 39 and 40) 
form conspicuous round projections inwards. The radiate spots correspond 
to the chorionic villi present on the opposite side. 
Utr. Mus. Cat. n° Nycticebus 41. 
Fic. 35.—Nycticebus foetus, wholly enveloped by the villiferous chorion, 
very shortly before birth. Between the villi the apertures (ap.) of the 
chorionic recesses (cf. Fig. 39) are visible to the naked eye. ‘To the right the 
villi are larger, but also more flattened and wider apart. 
Utr. Mus. Cat. n° Nycticebus 34. 
Fie. 36.—The same Nycticebus embryo of Fig. 30, to show its attachment 
by means of the umbilical cord (w.) to the chorionic envelope, which is 
partially turned inside out. 
Utr. Mus. Cat. n* Nycticebus 24. 
Fies. 37 and 37 a.—Three chorionic villi of Nycticebusas seen from 
above, enlarged x 27. They were taken from the specimen of Fig. 30, and are 
seen to be multilobulate. 
Utr. Mus. Cat. n° Nycticebus 24. 
Fic. 38.—The prominent network of the mucosa in which the chorionic 
villi fit. Also taken from the same specimen and enlarged x 27, 
Utr. Mus. Cat. n® Nycticebus 24. 
Fie. 39.—Transverse section of a portion of the chorion of Nycticebus. 
Blood-vessels are red. Epithelial covering of chorionic villi here and there 
thickened, more especially on the tops of the villi. Chorionic epithelium con- 
tinuous in the round and flattened recesses (#.) that open out in the extra- 
chorionic space by the apertures (ap.). 
Utr. Mus. Cat. n° Nycticebus 24. 
Fy. 40.—Another section of the chorion of Nycticebus, but with the 
