48 DK. J. MUEIE ON THE MANATEE. 



PLATE IX. 

 The Brain, Nerves, and Blood-vessels, of natural size. 



Fio-. 1. Side view. Drawn after preservation in alcohol, but modified from the cast and 



from a hasty outline of the object when fresh, 

 rig. 2. Top view, in situ within the skull. The accurate and finished drawing of this 



was made before the brain was removed, the bones only being worked up 



from the dried skull. 

 Fig. 3. Basal view, with cranial and three pairs of cervical nerves. This was drawn 



from the specimen after preservation in alcohol, but guided by a drawing 



taken immediately after extraction, when fresh, along with cast of the cranial 



cavity. 

 The lettering applicable to these three figures is as follows : — 1, 2, 3, 5, 6, 7, 8, 9, cor- 

 responding cranial nerves, the fourth not being shown, and 5* being lesser root of fifth; 

 C\ C% C'\ first, second, and third cervical nerves ; (ja, ganglion of same ; Ca, Casserian 

 ganglion; d\ the three divisions of the fifth nerve; yd, portio dura, and ym, portio 

 mollis of seventh nerve ; (jph, glossopharyngeal, ])n, pneumogastric, and spa, spinal ac- 

 cessory divisions of eighth nerve ; hy, hypoglossal or ninth nerve ; ga, ganglion of first 

 spinal nerve ; r, rete mirabile, and th, theca of spinal cord ; ac, anterior cerebral, mc, 

 middle cerebral, fc, posterior cerebral arteries ; ic, position of internal carotid artery cut 

 short ; W, circle of Willis ; h, basilar artery ; Fr, frontal bone cut through ; co, con- 

 dyle of occipital bone. 



