1865. ] PRESBYTES AND COLOBUS. 745 
The lungs had five lobes on the right side and four on the left ; 
length of each about 7 inches. Pancreas short, with a bifid extre- 
mity ; length 23 inches, breadth 14 inch. 
The right and left lobes of the liver were very disproportionate in 
size, the left being very much the larger of the two. 
I omitted to note the relative position of the liver to the stomach 
in situ; but from my sketch of the organ when taken out, it showed 
that whenever the stomach was distended with food it would press 
the left lobe of the liver over the much smaller right one, and this 
overlapping would produce the same irregular position of the liver in 
the right hypochondriac region as is recorded by Owen in S. entellus. 
The length of the left lobe, in C. guereza, was 73 inches, of the right 
4 inches. 
First. My observations, though not extensive, may help there- 
fore to bear out the fact that Presbytes albigena, Gray, is rather 
allied to the genus Cercocebus (where the skull has already been 
placed) than to the Indian group Semnopithecus, with which it was 
originally arranged ; so that I consider the animal in future ought to 
be known by the name of Cercocebus albigena. The fresh specimen, 
moreover, adds to the certainty of its African habitat ; but this, since 
M. du Chaillu’s collection has been known, could hardly be disputed. 
Secondly. The anatomical examination of Colobus guereza corro- 
borates what Owen has recorded of C. ursinus, and strengthens belief 
in the visceral peculiarities belonging to the entire genus. These 
apparent constant characters, when taken along with those of the 
cranium and dentition, add wonderfully to the family likeness of the 
genus Semnopithecus and Colobus ; and it seems that if they are not 
quite identical they run closely parallel, and are separated more by 
geographical than by anatomical characters*. 
* Tn ignorance of a short statement of Dr. Pucheran, that he believed the 
Presbytes aibigena of Dr. Gray to be a species of Cercocebus, I had, while writing 
the above paper, not consulted this authority. I find, however, that the first- 
named naturalist, in the ‘Revue et Magasin de Zoologie’ for June 1857, p. 242, 
expresses himself as follows as regards this species: —‘‘ Présentement cet indi- 
vidu est-il un Semnopithéque, comme I’a admis M. Gray, comme parait l’ad- 
mettre M. J. A. Wagner? Ce que nous pouvons certifier, c’est que son estomac 
est simple. Quant a la téte osseuse l’état des sutures atteste un individu encore 
jeune, et les derniers molaires sont encore renfermées dans leurs alvéoles; mais, 
nonobstant cette circonstance de jeune age, le crane et la face sont plus allongés 
que dans les tétes des Semnopithéques adultes. Par la forme de sa téte osseuse, 
le Presbytis albigena est un Cercocébe.” 
As I have not assumed the merit of being the first to point out that the Grey- 
cheeked Preshytes of Dr. Gray in reality possessed nearer affinities to the genus 
Cercocebus than to Semnopithecus, seeing that I make mention of the typical skull 
in the British Museum being now placed in the Osteological Collection along 
with the Cercocebus under the name C. albigena, I trust that it may not be con- 
sidered disrespectful towards M. Pucheran that I did not earlier refer to his 
opinion ; but as the volume of the ‘ Catalogue of the Bones of the Mammalia in 
the Collection of the British Museum,’ published in 1862, contains no reference 
to Dr. Pucheran’s paper, printed in 1857, I believe that I may, to a certain 
extent, throw the onus on the former publication, which, adopting the newer 
generic classification of the animal, gives no clue to the more recent authority. 
Looking at the matter in a broad light, and with no other desire than the 
