9 
310 EDGAR ALLEN 
of degeneration, but the ciliated cells covering the highly folded 
mucosa of the part leading from the ovisac show all stages of 
the extrusion of their nuclei. Some of these extruded nuclei 
still adhere to the free surface of the cells and are similar to 
nuclei of normal cells. Others show varying degrees of pycnosis. 
Many small regions are to be found devoid of cilia, apparently 
marking cells from which the nuclei have been extruded. A 
further description of this process will be undertaken later. 
The two oviducts in this animal contained eight ova, still in 
good condition, although in none was the zona pellucida promi- 
nent. (This may be due to the fixing reagent as stated by 
Sansom, ’20.) In most of the ova the second maturation spin- 
dles were still intact, but rarely were polar bodies recognizable. 
The ova were bunched in the last segment of the tubes. There- 
fore, ovulation occurred three days previously (H. P. Smith, 
dais 
The ovaries contain eight medium-sized follicles, all superfi- 
cially located. The primary liquor folliculi is beginning to form, 
but has not yet reached a stage far enough advanced to make 
possible the distinction of a cumulus. The nuclei of the ova are 
in the resting stage. In this pair of ovaries, there are more than 
thirty atretic follicles in all stages of degeneration, most of them 
deeply situated in the stroma. There are at least three sets 
of corpora lutea present.? The most recent corpora lutea are 
easily distinguishable from the older ones by their blue color, 
the latter staining more heavily with eosin. There are eight of 
this last set. They are similar in degree of development, so 
that a description of one will suffice for all. The central lake 
is almost obliterated, chiefly by the hypertrophy of the granu- 
losa cells which do not at this stage take eosin readily. The 
theca interna has entirely disappeared and the ingrowth of 
connective tissue has reached the edges of the lake and woven 
a fine reticulum about the inner walls of the luteal cells, at the 
same time beginning an arrangement of these cells into cords. 
Slight vascularization is evident, but there are erythrocytes in 
3 It should be understood here that all corpora lutea referred to in this paper 
are corpora lutea of oestrus, as no pregnant nor lactating animals have been used. 
