744 DR. J. MURIE ON SPECIES OF [Dec. 12, 
and in the less developed size of the lower incisors, the former cor- 
responds with the genus Cercocebus. 
The anterior premolar is longest in Semnopithecus, while in the 
adult P. albigena and the two species of Cercocebus it is rather 
smaller than the tooth posterior to it. 
The skull of the young specimen of Presbytes albigena, which 
has partly been the occasion of the present remarks upon the several 
genera, shows characters, even in its juvenile condition, which would 
prevent its being ranked with the genus Semnopithecus, although, 
at the same time, it must be admitted, as might naturally be ex- 
pected, that the distinguishing prominent points of difference are not 
so well marked as in the adult skull of the same species. Never- 
theless it bears out, though in a less forcible manner, what I have 
said, as a whole, of its closer resemblance to Cercocebus than to 
Semnopithecus. 
With respect to the genus Colobus, the skulls correspond in every 
particular to the genus Semnopithecus ; the three individual skulls of 
the former in the British Museum may be said to correspond with 
their African representatives as follows :—C. guereca with S. entellus, 
C. temminchii with S. melalophus (but not so laterally compressed), 
while C. polycomus may be likened to S. maurus or S. entellus. 
The crania of the Cercopitheci in some characters agree with Cer- 
cocebus, and in others slightly with Semnopithecus. 
As related to the present subject, I shall introduce some notes I 
made in January 1863, of the dissection of an adult male specimen 
of Colobus guereza, Riippell.. While at Nyambura, a village in the 
Moro territory, about sixty miles due west of Gondokoro, on the 
White Nile, an animal of the above species was shot by one of our 
party, and on my examining the viscera the following peculiarities 
were observed :— 
Stomach in dimensions : 
inches. 
Length of greater curvature ADOUGH © «. siedusse Ribs 29 
of lesser curvature about ............ ie 
Greatest breadth of organ............- Bache, Sa 
The viscus, when laid out flat, was of an elongated, somewhat 
pyriform shape, with many transverse sacculi, as in the first part of 
the great intestines of the human subject. The cardiac extremity 
was rotund and expanded ; there was a constriction to the left of the 
cesophagus, about as far distant as was the cardiac end from it; to 
the left of this constricted part the stomach was much narrower, 
and the sacculi less in capacity ; a third still narrower and more in- 
testiniform part stretched to the right of the last, and about equal 
to it in length. The accompanying diagram, which I lay before the 
Society, is from a sketch made at the time, and may convey a better 
idea of the appearance of the organs than a lengthened description. 
Small intestines, in length 8 feet 73 inches; the large intestines, 
including ceecum, 5 feet 9 inches. Czecum simple, very like the re- 
presentation given by Prof. Owen of that of Semnopithecus entellus ; 
length 1} inch, cireumference 4? inches. 
