The Placenta and Gravid Uterus of Carcharhinus falciformis

  title={The Placenta and Gravid Uterus of Carcharhinus falciformis},
  author={Perry W. Gilbert and Donald A. Schlernitzauer},
All elasmobranch placentae are of the yolk-sac type, but within this single classification rather wide structural variations occur. The placenta of C. falciformis possesses a discoidal shape and is completely nondeciduate. The following layers intervene between the foetal and maternal blood systems: (1) maternal endothelium, (2) maternal epithelium (essentially not reduced), (3) possibly the egg-case membrane, depending on factors stated in the paper, (4) foetal epithelium (greatly reduced… CONTINUE READING