304% | PROFESSOR TURNER ON THE PLACENTATION OF THE SEALS. 
placenta at the time of parturition so complete a shedding of the mucosa 
of the placental zone does not take place as was effected by artificially tearing 
off the placenta in an earlier period of gestation. The muscular coat is not 
exposed, but is covered by a layer of connective tissue, forming the deeper part 
of the sub-epithelial connective tissue of the placental area, in which portions 
of gland tubes and blood-vessels may be seen. This layer forms a non-deciduous 
serotina. The surface epithelium of this area and the more immediately sub- 
jacent tissue are, however, shed along with the placenta, and form a well-defined 
deciduous serotina, so that although the entire thickness of the serotina is not 
shed during parturition, yet a larger proportion falls off with the placenta than 
in the bitch, fox, and seal. 

