662 SIR WM. TURNER ON THE PLACENTATION OF HALICORE DUGONG. 



Plate III. 



Fig. 10. Surface view of the mucous membrane of the fecundated cornu in the placental zone. 

 The orifices of a number of the smaller crypts are represented, and at a the mouth of 

 one of the large crypts ; x 30 ; p. 645. 



Fig. 11. Vertical section through the mucous membrane of the placental zone ; x 60. The figure 

 shows the crypt layer, cr, and the glandular layer, gl, in the latter of which divided 

 glands are represented. The crypt layer consists for the most part of the shallower 

 crypts for the lodgment of the shorter villi ; but in the section one of the deeper and 

 more obliquely directed crypts can be seen. In this deep crypt the bulbous end of 

 one of the longer villi, v, is lodged ; p. 645. This and the following figure are from 

 drawings by David Hepburn, M.B. 



Fig. 12. Vertical section through the crypt layer, cr, and the more superficial part of the glandular 

 layer, gl, of the placental zone ; x 240. The epithelial lining of the shallower crypts is 

 seen, and in some of these loose epithelial cells occupy the recesses out of which the 

 shorter villi have been drawn. The section has also passed through one of the deeper 

 and more obliquely directed crypts, and the villus, v, which it contains has been 

 divided. The epithelial covering of the villus and the epithelial lining of the crypt 

 are in part in place, but for the most part have been detached from the surfaces which 

 they had covered. Closely subjacent to the deeper crypt is a gland, gl, with its 

 epithelial lining, which seems as if it might have opened into the crypt ; p. 646. 



