348 PHILOSOPHICAL TRANSACTIONS. [aNN0 1787. 



posterior extremities, neither do they meet at the fore part, or join the vertebrae 

 of the back. The erectores penis are very strong nuiscles, having an origin and 

 insertion similar to those of the human subject. The acceleratores muscles are 

 also very strong; and there is a strong and long muscle, arising from the anus, 

 and passing forwards to the bulb of the penis, that runs along the under surface 

 of the urethra, and is at last lost or inserted in the corpus spongiosum. This 

 muscle draws the penis into the prepuce, and throws that part of the penis that 

 is behind its insertion into a serpentine form. It is common to most animals that 

 draw back the penis into what is called the sheath, and may be called the re- 

 tractor penis. 



In all the females that I have examined, the parts of generation are very 

 uniformly the same ; consisting of the external opening, the vagina, the 2 horns 

 of the uterus, Fallopian tubes, fimbriae, and ovaria. The external opening is a 

 longitudinal slit, or oblong opening, whose edges meet in 2 opposite points, and 

 the sides are rounded off, so as to form a kind of sulcus. The skin and parts on 

 each side of this sulcus are of a looser texture than on the common surface of 

 the animal, not being loaded with oil, and allowing of such motion of one part 

 on another as admits of dilatation and contraction. The vagina passes upwards 

 and backwards towards the loins, so that its direction is diagonal respecting the 

 cavity of the abdomen, and then divides into the 2 horns, one on each side of 

 the loins ; these afterwards terminating in the Fallopian tubes, to which the 

 ovaria are attached. From each ovarium there is a small fold of the peritoneum, 

 which passes up towards the kidney of the same side, as in most quadrupeds. 



The inside of the vagina is smooth for about 4- of its length, and then begins 

 to form something similar to valves projecting towards the mouth of the vagina, 

 each like an os tincae ; these are about 6, 7, 8, or 9 in number. Where they 

 begin to form, they hardly go quite round, but the last are complete circles. 

 At this part too the vagina becomes smaller, and gradually decreases in width to 

 its termination. From the last projecting part, the passage is continued up to 

 the opening of the 2 horns, and the inner surface of this last part is thrown 

 into longitudinal rugae, which are continued into the horns. Whether this last 

 part is to be reckoned common uterus or vagina, and that the last valvular part 

 is to be considered as os tincae, I do not know ; but from its having the longitu- 

 dinal rugae, 1 am inclined to think it is uterus, this structure appearing to be 

 intended for distinction. The horns are an equal division of this part ; they 

 make a gentle turn outwards, and are of considerable length. Their inner sur- 

 face is thrown into longitudinal rugae, without any small protuberances for the 

 cotyledons to form on, as in those of ruminating animals ; and where they ter- 

 minate the Fallopian tubes begin. 



In the bottle-nose whale, where the Fallopian tubes opened into the horns of 



