504 PHYSIOLOGICAL SERIES. 



D. 796. The posterior part of the spinal cord of the same Whale, 

 from the dorsal surface of which the loft half of the thick 

 dura mater has been removed, showing that it forms ;i 

 comparatively close investment to the cord, as in the 

 Porpoise (D. 791;, and that the long separate root> of 

 the posterior nerves, that compose the eaiula eijuina. 

 are external to the common d ura mater investment of the 

 cord, although each is covered by an independent sheath 

 derived from that investment. O. C. 1364. //>//,(, //>ui. 



PRIMATES. 



D. 797. " Part of the brain, and the whole medulla spinalis of a 

 common Monkey. The dura mater is in part removed 

 from the front [ventral] part, and exposes the can da etpiina. 

 which is inclosed in that membrane. There is little or no 

 difference between these parts in this animal and rhe human 

 subject, only that the dura mater is not so large in propor- 

 tion to the size of the medulla/' The braehial and crural 

 swellings are well shown. 0. C. 1375. HunUrian. 



D. 798. The cerebellum, medulla oblongata, and spinal cord of 

 a young Orang-Outang (Simla satyrim) exposed from the 

 dorsal aspect. The proximal part> of the fir>t pair of rib> 

 have been left to mark the limit of the cervical region of 

 the cord. The braehial swelling is strongly pronounced. 

 The large size of the nerves ari-ing from it is well shown, 

 and the abrupt termination of their dorsal root- in tin- 

 lateral dorsal furrow of the cord. Behind the cervical 

 region the nerve-roots take a very oblique hack \\ard eonr.-e 

 and on a level with the second lumbar vertebra form the 

 eanda equina. The lumbo-sicral spelling i- MT\ >light. 



The ganglia upon the dor-al nerve-root- can be clearly 

 seen; in the cervical region they lie upon the rooi- in the 

 intervertebral canals, hut further hack are -ituated within 

 the neural canal before the ner\e pa e- between the 

 vertebra. O.C. i:J7:> i.. 



/'/, srnl,-,l //// Sir I'iiiin- II 



Figueiredo-Rodriques, Arch. Mikr. Anat., Bd. lix. r."U. 

 p. 417. 



