SPOLIA NEMORIS. 97 
future researches—perhaps to the Primates.” What Selenka 
has since made known with respect to monkeys, indeed, shows 
a close resemblance between man and certain monkeys with 
respect to these placental phenomena.’ And I would now 
venture to insert in the above citation, after the word “ Pri- 
mates”: “and to the Prosimiz.” 
In accordance with this it will be seen that in the present 
paper I have used the term chorion a few times only in refer- 
ence to Nycticebus and Tarsius, whereas with respect to the 
other mammals I prefer to employ the term “ diplotrophoblast ”” 
(l. c., p. 885). It is thereby testified that a foetal envelope is 
present which is only secondarily vascularised, either by the 
vessels of the allantois or by those of the yolk-sac. 
And thus, for the present, the new data here adduced for 
Nycticebus are restricted to the fact that the embryo of Nycti- 
cebus is enclosed in a complete sac which is entirely covered 
with thick villi, and which is very loosely attached to the 
vascular meshes of the mucosa into which the villi fit. 
I hope to be able to furnish ample information concerning 
the ontogenesis of the chorion, &c., in a later publication. 
A short reference to the two figures 55 and 56 should yet be 
made. Fig. 55 is an enlarged photograph of part of the same 
preparation represented in fig. 35. The actual shape of the 
villi, their flattening and partial disappearance towards the 
right extremity, is here better visible than in the lithographic 
figure. 
Fig. 56 shows very graphically what becomes of the earlier 
network of the mucosa that was represented in fig. 51. The 
frilling of the border of the ridges, which is not yet present in 
the latter preparation but which becomes conspicuous in the 
later phases of pregnancy, is better brought out in this photo- 
graph than in the still more enlarged fig. 38. 
The big folds that are visible in fig. 56 have arisen in conse- 
quence of an intentional folding backwards of the uterine walls. 
All around the central depression the reticulation is less 
1 ‘Studien z. Entwickelungsgeschichte der Thiere,’ Heft 5, pl. 35, fig. 11; 
pl. 36, fig. 5. 
VoL. 86, PART 1.—NEW SER. G 
