SIR WM. TURNER ON THE PLACENTATION OF HALICORE DUGONG. 661 



EXPLANATION OF PLATES I, II., III. 



Plate I. 



Fig. 1. A view of the gravid uterus of Halicore Bugong, greatly reduced : /, the fecundated left 

 uterine cornu ; nf, the non-fecundated right cornu ; v, the vagina ; uu, the two ureters 

 opening into the bladder ; p. 642. From nature, by my pupil, Mr Harry G. Melville. 



Fig. 2. The chorion extracted from the uterus of the same animal, showing the zonary placenta 

 and the umbilical vessels ramifying in the smooth parts of the chorion : h, opposite the 

 head of the foetus ; a, opposite the anterior extremity ; t, opposite the tail ; u, opposite 

 the umbilical cord, greatly reduced ; p. 648. Figs. 2 and 4 were drawn from nature by 

 Mr Michael Scott. 



Fig. 3. One of the shorter villi of the chorion detached from its neighbours, and with its branches 

 drawn asunder; x 13; p. 649. From a drawing by the senior demonstrator of anatomy, 

 David Hepburn, M.B. 



Fig. 4. Chorion of a Oat in an early stage of gestation, to show how extensively the villi are diffused 

 over the surface, also the non-villous character of the poles ; natural size ; p. 653. 

 From a specimen which I have placed in the series of placentas in the Anatomical 

 Museum of the University of Edinburgh. 



Plate II. 



Fig. 5. Surface view of the mucous membrane of the left fecundated cornu of the Dugong in the non- 

 zonary area. The uterine glands may be seen ramifying in the mucous membrane, and 

 the dilated mouths open obliquely on the surface; x 30; p. 643. The figures in this 

 Plate, and fig. 10 in Plate III., were drawn from nature, by my pupil, Mr Gustav Mann. 



Fig. 6. Vertical section through the mucous membrane of the same cornu in the non-zonary area. 

 Sections through the gland-tubes occur at different depths, and separated by relatively 

 wide intervals occupied by interglandular connective tissue : m, the mouth of a gland 

 opening on the surface ; v, a transversely divided blood-vessel ; mc, muscular coat; X 80; 

 p. 644. 



Fig. 7. Vertical section through the mouth of the gland, m, shown in fig. 6 and the adjoining part 

 of the mucous membrane; x 400. The oblique direction of the gland-mouth and the 

 appearance of the columnar epithelium cells which occupy the parts of the gland-tubes 

 that lie near the surface of the mucous membrane are shown. The interglandular 

 connective tissue contains numerous leucocytes, I, as well as connective tissue corpuscles ; 

 v, a transversely divided blood-vessel ; p. 644. 



Fig. 8. Vertical section through the closed end of a gland in the deeper part of the mucous 

 membrane ; x 450. The epithelial lining of the gland consists of cubical cells ; p. 644. 



Fig. 9. Vertical section through the mucous membrane of the non-fecundated right cornu of the 

 same uterus ; x 80. The gland-tubes are smaller than in the fecundated horn, and as 

 the interglandular connective tissue is much less abundant, the tubes are much closer 

 together. Compare this figure with fig. 6. v, blood-vessels divided ; mc, the muscular 

 coat; p. 647. 



VOL. XXXV. PART II. (NO. 17). 5 O 



