Text-fig. 6. a) Line drawing of the exposed side of the fetus of Eurohippus messelensis from Messel. Bones of the mare are shown for orientation. Notice the fine wrinkling lateral to the right femur of the fetus. The white line distinguishes the uteroplacenta on the left from the exposed bones of the fetus on the right. Scale = 5 cm; b) the SEM photo reveals that the wall of the uterus is replaced by petrified bacteria, preserved as siderite (FeCO3). Drawing and anatomical interpretation by author; SEM photo by Renate Rabenstein (both Senckenberg Research Institute Frankfurt). in Report On The Discovery Of Fossil Mares With Preserved Uteroplacenta From The Eocene Of Germany