1881.] 



MR. \V. A. FORBES ON THE KOALA. 



187 



The spleen, as usual in Marsupials, is somewhat triradiate in 

 shape, being broader and forked at one end, tapering and more 

 pointed at the other. Its greatest length is 2^ inclies. There is 

 a lymphatic gland, the size of a pea, outside each marsupial bone, 



■Uf 



The same, from below. 



_ R.C. Right central lobe ; L.C. left central lobe ; E.L. right lateral lobe; L.L, 

 left lateral lobe ; C. caudate lobe ; SP. Spigelian lobe ; G.B. gall- 

 bladder; G.D. bile-duct; r.l.f. right lateral fissure; /././. left lateral 

 fissure; «./. umbilical fissure; c.f. cystic fissure ; V.C. ve-na cava infe- 

 rior ; V.P. vena fortm ; V.H. hepatic vein. 



and a pair of similar ones, superficial, on the neck. The axillary 

 glands are large. 



The heart is of the usual Marsupial type. The right auriculo- 

 ventricular valve is membranous, and nearly complete all round the 

 aperture, being largest on the right side. It is attached to two, or, 



