18G6.] ON THE ANATOMY OF THE CRESTED AGOUTI. 387 



The uterus is nearly an inch long from the fundus to the os tincse, 

 and its cavity is divided by a median septum to within 0*2 of an 

 inch of the latter part. Each cornu is continued from the fundus of 

 the uterus for 1^ inch, and is almost as wide as each of the divisions 

 of the body of this viscus. 



The ovaries are small. The broad ligaments as a whole are thin, 

 but have a great number of parallel slightly contorted tubules run- 

 ning from each Fallopian tube towards the pelvic attachment of the 

 ligament. These evidently represent the remnants of the Wolffian 

 ducts. 



Vascular System. 



The arch of the aorta is short and narrow, the arteria innominata, 

 left carotid, and left subclavian arteries are given off close together, 

 and they are of nearly equal size. The arteria innominata is 0'4 inch 

 long to where it gives off the right carotid. About 025 inch from 

 this is the vertebral artery, which is of narrow calibre ; immediately 

 beside it to the right, and from the same (anterior and inferior) side 

 of the subclavian the inferior thyroid, supra- and posterior scapular 

 branches are derived. These can hardly be said to spring from the 

 thyroid axis, but diverge along with the vertebral artery from the 

 main trunk. The internal mammary arises on the opposite (pos- 

 terior or superior) side of the subclavian to those above mentioned, 

 and it proceeds into the thoracic cavity behind the whole of the rib- 

 cartilages. 



The superficial femoral artery is given off from the larger and 

 deeper femoral artery below the crural arch. It divides half an inch 

 below this, — one, moderate-sized division going outwards, which at 

 about an equal distance again divides into two — one of these last 

 branches supplying the tensor vaginae femoris, the other piercing the 

 rectus muscle superficially and vastus interims beneath, also sending 

 off slight twigs to the inside of the gluteus maximus. 



The second, larger and longer division, accompanied by the saphe- 

 nous nerve, passes quite superficially down the limb, crossing at an 

 acute angle the shaft of the femur. It is adherent to the gracilis 

 muscle opposite to the head of the tibia, and just where its fibres 

 become aponeurotic (see fig. 4). Crossing the lower fifth of the 

 shaft of the tibia it reaches the dorsum of the foot beneath the 

 tibialis anticus tendon, and it then proceeds forwards between the 

 inner and middle metatarsal bones. Previously to crossing the tibia 

 a branch is sent to the inner side of the os calcis. 



The deep femoral artery is much greater in calibre than the super- 

 ficial femoral. There are numerous small muscular branches given 

 off in the groin. As it continues downwards it lies upon the adductor 

 magnus, but does not pierce the muscle ; so that there is no Hunter's 

 canal. 



Twigs are given to the adductors and sartorius. At the lower 

 border of the adductor magnus it sends a large off-shoot to the semi- 

 membranosus, while the main trunk continues to the popliteal space 

 close behind the femur. 



