138 T. THOMSON FLYNN 



ment is, in manj'^ cases, somewhat invj^ular, as is shown in 

 figs, 1 and 2 (cav.), hut a glance at the further fig. 8, which 

 depicts quite a common arrangement, will show that in many 

 cases the syncytial nuclei come to form a more or less definite 

 layer round the central space. 



The latter becomes filled by infiltrated lymphatic material 

 (fig. 3, inf.), which in fact is copiously (hstributed throughout 

 the syncytium in and between the lobules. At this stage also 

 the sj'^ncytium is well Aascularized. each capillary l^eing enclosed 

 in its delicate endotlielial layer. Endothelial cells and leuco- 

 cytes are a well-mark(^d feature of the syncytium. Tliey will 

 be referred to in more detail later on. 



The syncytium outside the allantoic placental area gradually 

 decreases in thickness. In the region opposite the bilaminar 

 omphalo])leure the arrangem(mt of the nuclei is essentially in 

 groups similar to those of the placenta area, yet these aggrega- 

 tions are not so distinctive nor so individual as in that area. 



This portion of the uterine epithelium is also extremely well 

 supplied with capillaries, many of which reach the surface. 

 Lymph also finds its way into the uterine lumen through the thin 

 portions of the uterine- epithelium between the ill- defined 

 syncytial nests. 



Leucocytes are also present in this region but not nearly so 

 plentifully as in the allantoic placental area. 



Remainder of the Mucosa . — The main portion of this 

 consists of the much- branched connective-tissue cells, the 

 branches of which are extremely delicate and contain in their 

 meshes abundant lymph material. Li the stroma are contained 

 glands and blood-vessels, and around these the connective tissue 

 is condensed to form a thin investing layer. 



One feature of this stage is that the glands in the allantoic 

 placental region are narrower and more closely packed than in 

 the remainder of the mucosa. No doubt proliferation of the 

 glands has occurred, their length has increased, and their 

 courses become more tortuous without there being as yet 

 a sufficiently accommodating increase in the thickness of the 

 mucosa. They measure in this region, on the average, -05 mm. 



