11 



the third or internal flap. were attax:hed to a very short and thick 



valve was a fleshy column. connecting the waU of the nght ventricle 



'' At'thfo"rigin of the aorta there was a single small curved bone 



The irŠf the aorta, after distributing the vessels to the heart 

 Je orfirsl a large innominata, which subdmded mto the nght 

 SrtebrS artely the right brachial artery, and the commori trunk of 

 Te two ca otS ; secondly, the left brachial artery ; thirdly. the left 

 lertebral artery. The cominon trunk of the two carotids was remark- 

 Sffor itfSth. The cranial pledus of the internal carotid was 

 much less developed than in the ordinary grazmg Rummants. 



Nervous System. 

 The brain of the GirafFe closely resembįd, in its Sf .^^''^l į°f ' ^°^ 

 in the number, disposition, and depth of the convolutions, that of the 

 Deer it was more depressed than in the Ox, and the cerebrum was 

 whoUy anterior to the cerebellum. The antenor contour of the 

 rerebral hemispheres \vas somewhat truncated. . , _ . . 

 "The convolu'tionsn.ightbereadilydivided, as - other Rumman s, 

 into primary and secondarj^ ; they averaged a breadthof three lines 

 and were almost symmetrical in the two hemispheres. There was little 

 tvmmet^y i^ the disposition of the primary convolutions m the cer.- 

 Sm t\e middle one on the upper surface, representmg the su 

 perio^ vermiform process, pursued a ^va^7 course from side to side 

 Che inferior vermiform process was straight. and vei^ prommently 

 developed these, ^vith the lateral convolutions of the cerebeUum 

 tere subd vided by narrow and, for the most part transverse folds. 

 Mr Owen also eniers into a detailed account of the mtemal struc- 

 tuJe of the brain; and concludes his descnption of this organ by 

 giving the following admeasurements : Inches. Lines. 



Totai length of the brain 5 ^ 



Vėrtical diameter of ditto 2 8 



Breadth of the cerebrum 4 3 



Length of the cerebellum 1 10 



Breadth of ditto 2 5 



Length oi pons varolii 1 O 



Breadth of ditto 1 . ^ 



Weight of the brain, 14oz. avoirdupois. 

 The olfactory ner^-es vrere large, as in most Rumimntias.nA ter- 

 minated in exįanded bulbs, in length 1^ inch, ^^ breadth 1 inch: 

 these ^vere lodged in special compartments o the ^^^^"^f .^^j^^Jį^^^^^^ 

 optic nerves and ninth pair were relatively larger than in the Deer. 

 The other cerebral nerves presented no peculiarity. 



The spinal chord had a close investment of dura mater, and >^as 

 remarkable for the great length of its cervical portion, J^^^l^' ;" ^^^^^ 

 Giraffe dissected at the Zoological Gardens measured upwards of 

 three feet. the entire length of the animal from the m^uzzle to the 

 vent beino- eight feet. Mr. Owen here particularly descnbes the ap- 

 pearancei'nthe origins of the cervical nerves depending upon the 



