( 1083 ) 
“and vesicle the bladder subsequently grew and so the allantois 
“was formed” any fruitful discussion on my phylogenetical specula- 
tions is excluded from the starting point. And L prefer to abide by 
Mac Bripe's final jugdment, that: “Prof. Hesrrenr has read the book 
“of Vertebrate development upside down” until an accumulation of 
facts on either side will have brought the balance into a position 
that will allow us to determine what is wp and what is down. 
FRELANATION OF FIGURES." 
1—5. Dasyurus N°. 7. 
do 
la—lc. Three sections through blastocyst and shell. In «a and b only 
trophoblasteells; in ¢ the inner cell mass (embryonal knob?) enclosed in 
matrix (coagulum ?). 
Fig. 2and3. The two sections through the inner cell-mass immediately following 
that of fig. Le. 
Fig. 4a—/. Eleven consecutive sections through the above, numbered so as to 
enable us to reconstruct the mulberry shape. 
Fig. 5. The actual reconstruction of the 16 cells composing the inner cellmass. 
Fie. 6¢—6g. Dasyurus N° 11. 
Six sections, of which /—f are actually consecutive, showing accumu- 
lation of massive cells in one blind corner of the blastocyst. It is closed at 
the other end in 26 consecutive sections situated before Ga; it is thus 
unilaminar. In 65 the eggshell is indicated. 
Fig. 7a—d. Dasyurus NO. 12. 
Sections through the same blastocyst and inner cell that have served 
for Prof Hur's fig. 37. The nucleus (?) of what Hur calls the coagulum 
has a very different character from that of the cell. 7a has its place in the 
series between 7) and 7c. 
Fig. 8. Dasyurus N°. 9. 
A section showing shell, trophoblast and two apparently independent 
cells inside the blastocyst. 
Fig. 9a—d. Daysurus N°. 8. 
Four sections through a blastocyst that has many points in common with 
that of fig. 1—5. The size of the cells of the inner cell-mass is interme- 
diate between that of fig. 7a and fig. 1¢; the number is also about 16; 
the matrix (coagulum) is less regular. The number of trophoblast cells is 
62, they are less numerous than in fig. le where we count 192, 
Fig. 10 and 11. Copies of two figures taken from SELENKA's development of the 
Opossum (Wiesbaden Kreidel 1887) showing (fig. 19) Setenka’s *Uren- 
todermzelle” and (in fig. 11) the contrast between tropoblast and triner cell 
mass, the lalter on the point ef coming to the surface. 
1) The number by which the Dasyurus are referred to in this paper refer to 
preparations which in Hur's collection are labelled as follows : 
Dasyurus 7: 2. 16. Vil. Ol. ** 39 
5 8: 2B..16. Vil old? 
8 9: 46. Picro. abn. 29. 6. 04 
„ 10: 45. Herm. abn. 29. 6. O04 
5 11: 45. Herm. * 29. 6. O4 
ls 2B. 16, VUE A 
