712 Mil. r. a. pahsons on tub [June l(i, 



does not enter the sciatic trunk, joining the 2nd sacral ; it supplies 

 the pelvis and perineum. 



The great sciatic nerve leaves the pelvis through the great sciatic 

 foramen, passing superKcial to the pyrifonnis ; just before 

 reaching that muscle it gives off a large nerve to the liamstrings, 

 which passes deep to the pyriforrais and supplies the posterior 

 biceps, semimembranosus, semitendinosus, and the ischio-femoral. 

 In the upper third of the thigh the great sciatic gives off the short 

 saphenous which supplies the skin of the outer side of the leg 

 from the knee to the ankle. About the middle of the thigh the 

 sciatic divides into external and internal popliteal branches, the 

 former of which winds round the outer side of the head of the 

 fibula, where it divides into the rausculo-cutaneous and branches to 

 supply the peroneal and extensor groups of leg-muscles. 



The musculo-cutaneous runs down the outer side of the leg and 

 divides at the ankle into an outer and an inner branch ; the outer 

 of these supplies the cleft between the fourth and fifth toes as well 

 as the outer side of the fifth, the inner goes to the inner side of the 

 large fourth toe as well as to the two small inner toes, that is to 

 say to the second, third, and half the fourth toes, the first toe being 

 absent. It will thus be seen that there is no anterior tibial nerve 

 in the Kangaroo, a fact which might be predicted when one 

 remembers that there is no cleft between the first and second toes 

 nor any extensor brevis digitorum muscle for it to supply. 



The internal popliteal nerve gives off branches for the gastrocne- 

 mius, plantaris, popliteus, and rotator fibula; ; it passes through the 

 popliteal space and runs down, between the superficial and deep 

 muscles of the calf, to the back of the iuiernal malleolus, being 

 unaccompanied in the leg by any artery. Soon after passing the 

 internal malleolus it gives off a small deep branch to the muscles 

 of the sole, which apparently corresponds to the greater part of 

 the human external plantar nerve. After this the main trunk 

 supplies the plantar surfaces of all the four toes, the branch for 

 the outer one and a half coming off in the anterior part of the 

 sole and passing deep to the plantar fascia. 



Digestive System. 



Tlie roof of the Hard Palate has eight transverse ridges, the 

 anterior two of which are curved, with the convexity forwards. 

 In the anterior half of the palate there are many tubercles 

 between the ridges, a condition which has been described by 

 Plower in the Didelphyidaj '. The Soft Palate is smooth on both 

 its nasal and buccal surfaces ; it ends posteriorly in a deep sharp 

 notch, and there is no sign of a uvula. 



The Tongue has four transverse ridges rather behind the 

 centre of the dorsum. There are backwardly directed filiform 

 papilla) all over the surface, while the fungiform papilliB are best 



' Lectures on the Comparative Anatomy of tlie Organs of Digestion of tlie 

 Mammalia, College of Surgeons, 1872, Lecture XII. 



