u 
of the triangle, a seam or mesentery-like fold of the allantois extends 
to each set of the allantoic vessels. These folds correspond to the two 
constrictions marked respectively as the right, and left, constric- 
tions in Fig. 4. The allantois, therefore, presents in this ventral view 
two lobes which never fuse with each other. The anterior lobe corre- 
sponds to those marked the middle, and left, lobes in Fig. 4 and 
the posterior lobe to that marked the right lobe in the same figure. 
Against the triangular area left bare by the allantois, a small mass 
of the white remains up to very later stages, having undergone the 
same chemical changes as in Clemmys. The outer cells of the 
serous envelope are also modified in the same way as those of the 
corresponding part of Clemmys. There is however no process which 
penetrates into the white. ‘The indentation in which the white is 
received is slightly deeper. 
Noteworthy features in the history of the foetal membranes of 
Chelonia are then as follows: 
1. Presence of the proamnion and the manner in which it is 
replaced by the permanent amnion. 
2. Presence of a peculiar tube stretching posteriorly from the 
posterior end of the amnion connecting the cavity of the latter with 
the exterior. 
3. Permanence of the sero-amniotic connection. 
4, Differences in the fate of the sero-amniotic connection in 
Clemmys and Trionyx. 
5. Presence of the rudimentary „placenta“. 
Imperial University Tokyo (Japan), June 97130; 
Nachdruck verboten. 
Über die Färbung der markhaltigen Nervenfasern in den 
Schnitten des Centralnervensystems mit Hämatoxylin und mit 
Karmin. 
Von N. Kutrscurrzxy, Professor der Histologie und der Embryologie 
an der Universität zu Charkow. 
I. Hämatoxylin-Färbung. Vor einem Jahre habe ich eine 
Färbungsmethode für Präparate des Centralnervensystems mit Häma- 
toxylin beschrieben, die im allgemeinen ganz dieselben Resultate giebt 
wie die WEIGERT’sche, d. h. die markhaltigen Nervenfasern färben 
37* 
