PLACENTAL STRUCTURES OF THE TENREC. 313 



DESCRIPTION OF PLATE L. 



Explanation of the lettering of the Figures. 

 A. Amnios. 

 B V. Blood-vessels, 

 c. Foetal surface of deciduous serotina concentrically corrugated for reception of 

 (pl') upgrowth of placenta. 

 CH. Chorion. 

 ch'. Upgrowth of chorion supporting umbilical vessels, and joining uterine mucous 



membrane at u p. 

 c M. Circular muscular coat. 

 D R. Decidua reflexa, or remnant of it. 

 D s. Deciduous serotina, or part of utero-placental raucous membrane which comes 



away with placenta. 

 D s'. Downgrowth of deciduous serotina coming into relation and connexion with 



placenta. 

 D s". Fimbriae, or tag-like outgrowths of decidua serotina, attaching it to the non- 

 placental uterine mucous membrane. 



F. Membrane connecting upper surface of placenta with inner aspect of lower end 



of downgrowth of deciduous serotina by g. 



G. Membrane connecting downgrowth of deciduous serotina with process of upper 



surface of placenta. 

 L M. Longitudinal muscular coat. 



M. Mesometrium. 

 M M. Muscular walls of uterus, 

 p. Peritoneal coat of uterus. 

 PL. Placenta. 



pl'. Upgrowth of placenta, " Kern" of Bischoff (Meerschweinchen-Ei, pp. 43 & 44). 

 p s. Persistent or non-deciduous serotina, the part of the utero-placental mucous mem- 

 brane which is not separated or shed away from the placental area at or after 

 parturition, 

 u c. Umbilical cord. 



u M. Non-placental uterine mucous coat. 



u p. Parapet connecting uterine mucous coat with decidua serotina, and so mediately 

 with the rest of the after-birth. 



