706 ME. F, G. TAnsoNS ON THB [June 16, 



flcial and deep divisions of the anterior crural nerve. A little 

 lower down an internal circumflex comes off, which divides into a 

 largo transverse and a small ascending branch. The femoral 

 artery then continues down Hunter's canal, but no profunda 

 femoris is given off. At the lower part of the canal it divides into 

 two large branches, of which the anterior accompanies the internal 

 saphenous nerve to the inner side of the leg. A little above the 

 internal malleolus it divides into anterior and posterior, the former 

 passing in front of the malleolus and deep to the tendon of the 

 tibialis anticus, to supply the inner side of the dorsum of the foot, 

 the latter supplying the sole of the foot, though no distinct 

 external and internal plantar arteries are present. The posterior 

 of the two branches of ihe femoral in Hunter's canal is the 

 popliteal, this passes between the semimembranosus and the femur, 

 and divides into superficial and deep. The superficial is a muscular 

 branch to the calf-muscles and runs down between the gastrocne- 

 mius and plantaris. The deep passes deeply to the plantaris, pierces 

 the interosseous membrane to become the anterior tibial, and runs 

 down along the outer side of the tendon of the extensor longus 

 digitorum to the dorsum of the foot, the outer side of which it 

 supplies. As soon as it reaches the commencement of the dorsum 

 it gives off a communicating branch which passes superficial to the 

 extensor longus digitorum to join the anterior branch of the 

 internal saphenous artery already mentioned. 



The Internal Iliac artery divides into gluteal, pudic, and sciatic, 

 of which the last is the largest. 



The Veins correspond fairly accurately with the arteries, the 

 chief points worthy of notice being the large size of the external 

 jugular, the presence of two anterior and a single undivided 

 posterior venae cav£e, also of a single azygos vein, which lies on the 

 right side and receives the intercostal veins from both sides of the 

 thorax. 



The Nervous Si/stem. 



As the animal was not received in a perfectly fresh condition, 

 I made no attempt to examine the brain and spinal cord. 



The Cranial Nerves differ but slightly from those of Man : the 

 chief points of divergence noticed are : — (1) That the seventh 

 nerve only divides into three chief branches on the face ; (2) that 

 the depressor nerve is separate from the vagus and comes off from 

 the superior laryngeal as in the Eabbit ; (3) that the eleventh 

 nerve pierces the cleido-mastoid after supplying the sterno-mastoid 

 and then passes on to the trapezius ; (4) that there is no descend- 

 ing branch from the hypoglossal corresponding to the descendens 

 cervicis of human anatomy, but the omo-hyoid, sterno-hyoid, and 

 sterno-thyroid are supplied by a well-marked nerve which comes 

 off from the 1st and 2nd cervical and corresponds to the com- 

 municans cervicis. 



The Cervical Plexus is formed by the first four cervical nerves ; 

 there is the usual loop on the ventral side of the transverse process 



