PROFESSOR OWEN ON THE GENUS DINORNIS. 395 
DESCRIPTION OF THE PLATES. 
(All the figures are of the natural size.) 
PLATE XLV. 
Apteryx australis. 
Fig. 1. Side view of the brain, in situ, with dissection of nerves and of organ of smell. 
Fig. 2. Upper view of the brain, im stfu, with olfactory and trigeminal nerves. 
Fig. 3. Base of brain, with cerebral arteries and origin of nerves. 
Fig. 4. Base of brain, the cerebellum exposed by removal of the macromyelon. 
Fig. 5. Side view of the brain, dissected to show the corpus striatum. 
Fig. 6. Section of cerebellum and of part of cerebrum. 
Fig. 7. Cavity of the lateral ventricle of the brain. 
Fig. 8. Section of rhinencephala, showing their ventricle. 
Fig. 9. Section of the fore part of prosencephala. 
Fig. 10. Section, showing the anterior commissure. 
Dinornis giganteus. 
Fig. 11. Side view of brain. 
Fig. 12. Upper view of brain. 
Fig. 13. Base view of brain (represented by a cast of the cranial cavity). 
PLATE XLVI. 
Fig. 1. Dissection of the brain, of the fifth, seventh, and eighth nerves, and of the 
muscles of the eyeball of Apteryx australis. 
Fig. 2. Further dissection of the same parts, with the course of the optic nerve. 
Fig. 3. Dissection of the muscles of the mandible and tongue of Apteryx australis. 
Fig. 4. Ligaments and muscles of the mandible of the same. 
Fig. 5. Portion of the trachea of the Cassowary (Caswarius galeatus). 
Fig. 6. Portion of the trachea, including seven tracheal rings of Dinornis (ingens). 
Fig. 7. Tracheal rings of Aptornis defossor. 
Fig. 8. Stones from the gizzard of Dinornis elephantopus'. 
’ These pebbles constitute about one-third of the heap of such found within the space encompassed by the 
ribs and sternum of the skeleton of Dinornis elephantopus exhumed from the bog at Glenmark, Canterbury 
Settlement, Middle Island, New Zealand, of which the sternum is described in Part XIII., Zool. Trans. vol. vii. 
p- 115. No such pebbles occur, naturally, within a distance of thirty miles of that locality. 
I submitted them to the examination of the experienced officers in the Department of Mineralogy, British 
Museum, and append the following note from Tuomas Dayins, Esq., Assistant in that Department :-— 
«The pebbles supposed to have been contained in the gizzard of the Dinornis consist exclusively of varieties 
of quartz more or less crystalline or compact—sometimes amethystine, and also approaching in texture and 
colour the black cherty variety called Lydian stone or Basanite ; the two latter, however, are apparently of more 
exceptional occurrence. All are much worn, preserving little trace of their original fragmentary outline.” 
I have received pebbles smoothly rounded by the triturating work of the gizzard of the Dinornis, from other 
localities, under similar relations to the skeleton; their significance in association with bones of the trunk has 
probably been overlooked. 
