ON THE ARRANGEMENT OF THE FCETAL MEMBRANES IN THE CETACEA. 471 



extended between the Fallopian tube and the root of the ovary. Numerous 

 tortuous blood-vessels accompanied the Fallopian tube, branches from which 

 ramified between the layers of peritoneum which surrounded the mouth of the 

 tube. When these vessels were turgid with blood, the otherwise lax membrane 

 would doubtless have become tense, and capable of being accurately adapted to 

 the surface of the ovary. The lumen of the tube was throughout so large that a 

 full-sized catheter could be passed along it. Its mucous lining was elevated in 

 longitudinal folds, continuous at the uterine end with folds to be afterwards 

 described in the mucous membrane of the cornu. At the opposite end, where 

 the mucous lining of the tube became continuous with the serous membrane 

 surrounding the mouth, the folds diverged from each other, and then passed 

 outwards as foldings of the serous membrane, along the inner surface of the 

 trumpet-shaped mouth, as far as its free edge. 



The left ovary had been removed before the specimen came into my posses- 

 sion. The right ovary, about the size of a duck's egg, was attached to the 

 uterine cornu by its proper ligament. It lay in relation to the upper surface 

 of the broad ligament, with which it was connected by a mes-oarium 3 inches 

 in depth by 3^ inches in breadth, so that it could be freely removed to and fro. 

 Between the folds of the mes-oarium numerous blood-vessels passed to and from 

 the gland, and close to the hilum was a flattened body 2f inches long by 1\ inch 

 in its greatest transverse diameter, the relation of which to the ovary reminded 

 one of that of the epididymis to the testicle. The ovary was somewhat flattened 

 at the sides, and presented near the free convex surface a linear, slightly puck- 

 ered depression, which was in all probability a cicatrix. In other respects the 

 outer surface of the ovary was smooth, and its investing membrane was con- 

 tinuous with the mes-oarium. Beneath this membrane, an abundant venous 

 plexus, which was readily injected, and through which the injection passed 

 freely into the veins within the ovary and the flattened body at its hilum. A 

 vertical mesial section was then made through the ovary and the flattened 

 body. The latter was found to be composed of a close plexus of dilated and 

 tortuous veins and arteries imbedded in a dense connective tissue. The ovary 

 itself appeared to be completely occupied with a large corpus luteum, which was 

 3 inches long by 2 inches broad. It possessed a strongly marked central cica- 

 trix, much broader at one end than the other, which measured 1*8 inch in length 

 (fig. 2). From this cicatrix numerous slender bands radiated into the corpus 

 luteum, which possessed the characteristic yellow colour. Owing to the great 

 size of the corpus luteum, the proper ovarian substance was not at first recog- 

 nised, and it was only after a number of thin sections had been made and 

 examined under the microscope, that the ovarian stroma, pushed entirely to the 

 periphery of the ovary, and forming a sort of capsule to the yellow body, was 

 detected. In many parts of the periphery the stroma formed little more than 



VOL. XXVI. PART II. 6 G 



