504 PROFESSOR TURNER ON THE GRAVID UTERUS, ETC., IN THE CETACEA. 



Figure 9. Cell structures from one of the peculiar-looking bodies between the allantois and amnion : 

 a, cluster of hexagonal cells ; b, large brood-cell. The cells to the left are sketches of the 

 more usual forms. x 480 diameters. 



Plate XVIII. 



Figure 10. A magnified surface view of the injected uterine mucous membrane at a part where the 

 furrowed arrangement was well seen. Around the mouths of many of the crypts a 

 vascular ring may be seen, and at the bottom of more than one of the funnel-shaped 

 crypts a plug of epithelium projects, as at a, from the mouth of a gland. 



Figure 11. A highly magnified view of a uterine crypt obtained in a vertical section through the 

 crypt-layer. The general arrangement of the capillaries is well shown, and the epithelial 

 lining, as at a a. An utricular gland, b, may be seen passing to the bottom of a crypt. 



Figure 12. A magnified vertical section through the wall of the injected uterus ; a, the crypt-layer ; 

 b, the gland-layer ; c, the muscular coat. The relative vascularity of the different parts 

 is shown in the figure. 



Figure 13. Chorion reduced ^th ; a, the large intermediate non-villous spot opposite the os uteri ; 

 b b, the polar non-villous spots ; c c, the poles of the right and left horns of the amnion. 



Figure 14. A magnified surface view of the injected chorion; a a, the intra-villous capillary plexus; 

 b b, the extra-villous capillary plexus ; c, branch of the umbilical artery ; d, a rootlet of 

 the umbilical vein. In this figure the umbilical arteries and intra-villous capillaries are 

 coloured red, the extra-villous capillaries and umbilical vein black. 



Figure 15. A transverse section through the cord reduced -|- ; a, the umbilical arteries; b b, the 

 umbilical veins ; u, the urachus. 



Figure 16. Foetus of Orca gladiator reduced ^th. 



EXPLANATION OF WOODCUTS. 



Page 474. Surface view, under a low power of the microscope, of a portion of the unimjected uterine 



mucous membrane. The recesses, furrows, and pits into which the pockets or crypts open 



are darkly shaded in the figure. 

 Page 479. Stellate non-villous portion of the chorion opposite the os uteri. 

 Page 483. Outline diagrams to show the arrangement of the membranes at the stage of development 



described in the text ; A, longitudinal section ; B, transverse section ; E, embryo ; ch. 



chorion ; am. amnion, represented by dotted line ; al. allantois. 

 Page 498. Diagram of placenta of Orca — 



a. Cup-shaped crypt. 



b. Funnel-shaped crypt, with 



c. Gland opening into it. 



d. Fusiform connective tissue corpuscles of crypt. 

 e e. Large sub-epithelial corpuscles of same. 



//. Epithelial lining of crypts. 

 Blood vessels of crypt-layer. 

 Chorionic villi, with 

 Their epithelial investment. 

 h. Sub-epithelial corpuscles of villus, and 

 I. Fusiform connective tissue corpuscles. 

 m m. Intra-villous capillaries. 

 n n. Extra-villous capillaries. 

 The interspace between the foetal and maternal portions, in which the letters a b f and i 

 are placed, is for the sake of distinctness made comparatively wide in this figure. 



9 g- 



hh. 



i i. 



