By an examination of the adult pelvis and fetal skulls it will be seen that the shape of the quadruped birth canal accommodates the fetal head nicely when in extension since there is no large posterior cranial development, the head and neck being of nearly the same thickness. In the monkey, where the facial angle increases, the head does not advance as a pointed presentation but as an irregular surface—the chin, forehead or occiput. It is only when the head has assumed a high facial angle and a well developed occipital lobe and the pelvic inlet has become transversely wide, that internal rotation is necessary. Resuming a discussion of our records I shall at this place introduce additional cases of pathology in the parturient genital organ and then discuss the general system. Beside the cases of dystocia discussed in preceding pages there occurred in a deer a complete eversion of the uterus, which was incompletely involuted, accompanying prolapse of the rectum and bladder due to straining after severe injuries, probably inflicted by a male. The animal lived long enough to develop a purulent cystitis which spread to the vagina, uterus and pelvic soft parts. The left uterine cornu of an American bison was found to contain a decomposing fetus at about half term; general sepsis had supervened which led to the animal’s death in about a week, according to the keeper’s observations. The history of a monkey, followed through two pregnancies and finally dying of tuberculosis and sepsis is interesting.