278 



PROF. ST.-GEORGE MIVART ON THK 



[Feb. 21, 



the left segment. The left lateral lobe is larger than the left central. 

 The right lateral lobe extends more transversely than dorso-ventrally ; 

 roughly estimated, it about equals the left lateral lobe in size. The 

 right central lobe is quite undivided, showing only a superficial furrov? 

 on the middle of its abdominal surface. The Spigelian and caudate 

 lobes are both triangular in outline ; and neither exhibits any segmen- 

 tation. 



Thus the liver of Erethison differs much from that of Hystrix 

 javanica. In the latter I find^ that, though it agrees in having 



Fig. 7. 



Brain of Erethizon dorsatus. 

 A, upper surface ; B, ventral surface ; C, side view; d, olfactory lobe ; op, optic 

 nerves ; p.h, pituitary body ; 4, 5-7, 8, 9-12, pathetic, trigeminal, facial, 

 auditory, glossopharyngeal, and hypoglossal nerves. 



the right segment much larger than the left, yet the left central 

 lobe is larger than the left lateral one ; that the right lateral lobe 

 extends mainly dorso-ventrally ; that the right central lobe has a 

 very deep cystic notch, in which a gall-bladder is found ; that the 

 right lateral lobe is larger than the left lateral lobe ; that the left 



^ From a specimen (no. 808 c) in the Museum of the Koyal College of Sur- 

 geons. 



