AND OTHER PARTS OF HIPPOPOTAMUS. 513 
The results arrived at by MM. Leuretand Gratiolet* tepd strongly Page 12. 
in the same direction as those subsequently arrived at by Dr. Krueg ; 
nevertheless there is a completeness about the investigation of the last- 
named author which greatly increases the importance of his work. 
As it is my intention on the present occasion to employ the nomen- 
clature adopted by Dr. Krueg, I cannot do better than introduce it 
by applying it to the description of the typical Artiodactylate brain 
as represented by that author. : 
Perhaps no nearer approach to this type can be given than that of 
the foetal sheep (Ovis aries), 27°5 centimeters in length, figured by 
Dr. Krueg (figs. 1—3). Putting what is to be seen in words, the 
small upward-directed processus acuminis (sac) of the Sylvian fissure is 
just seen on the outer border of the superior surface of the cerebral 
hemisphere, along which latter surface the swpra-sylvian fisswre (ss) 
Fig. 3. 
Sheep’s brain: fig. 1. Outer aspect; fig. 2. Superior aspect ; fig. 3. Inner aspect. 
(After Dr. Krueg.) 
courses longitudinally nearly from end to end, slightly concave out- 
wards opposite the Sylvian fissure. According to Dr. Krueg, this 
fissure (ss) has three limbs; but four seems to me to be the more 
correct number. Of these one is anterior (ssa), the second superior 
(sss), and the third posterior (ssp). The fourth, according to me, 
runs downwards (ssd) from the spot of origin of the posterior limb. 
Typically, all these processes terminate freely. 
Next in importance, on the superior surface, is the coronal fissure 
(co), longitudinal in direction, at no great distance from the middle 
line of the brain, and situated so far forward that its posterior 
extremity is in front of the superior limb of the supra-sylvian fissure 
(sss). It runs forward almost to the anterior margin of the hemi- 
sphere. 
A minor longitudinal (/ateral) fissure (1) tends to divide the sur- 
face between the posterior branch of the supra-sylvian fissure and the 
* “ Anatomie Comparée du Systéme Nerveux,” Paris, 1839-1857. 
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