SPOLIA NEMORIS. 89 
type. It has not the faintest trace of any relation whatever to 
the diffuse type, which was hitherto considered as being the 
type of placenta to which the Lemuride belong.! 
The umbilical cord by which the embryo is connected with 
the placenta is comparatively short; it is represented in figs. 
20 and 21, containing very prominent vessels. 
In fig. 21 the ramification of these vessels on the placenta is, 
moreover, indicated as this is seen (in a spirit specimen) 
after the removal of the foetus. Fig. 49 represents the foetal 
membranes and the placenta with severed umbilical cord after 
they have been removed out of the uterus, and the foetus has 
passed out of its envelopes. 
These envelopes having here been preserved after the foetus 
had been expelled are less stretched and transparent than those 
of figs. 18 and 47. The afterbirth of Tarsius (which is expelled 
in the customary way and not resorbed in situ, as that of 
Talpa) consists of these same parts; the envelopes are then 
more folded together against the knob-like placenta than in 
fig. 49. ; 
Embryos of Tarsius are in my possession from the earliest 
stages of segmentation up to the newly born young. Two of 
them are represented in figs. 46 and 48. In the first the 
comparatively large size of the head is worthy of note; in the 
second the way in which limbs, fingers, and tail are tightly 
folded together against the body in a small compass deserves 
special attention. 
The details of the ontogeny of Tarsius, which as yet has 
never been investigated embryologically, I hope to be able to 
work out soon with the aid of the very complete material now 
at my disposal. 
With respect to the details of the placentation process I will 
also have to refer to a later publication, and can only state 
that the trophoblast of the very early two-layered blastocysts 
undergoes a most considerable amount of proliferation at the 
spot where the uterine surface has in its turn undergone certain 
1 Cf. a preliminary notice in the ‘ Proces Verbaal van de Koninkl. Akademie 
van Wetenschappen te Amsterdam,’ Zitting van 2 April, 1892. 
