420) REPORT OF THE HARVARD AFRICAN EXPEDITION 
Enterobius or Trichuris were observed. The action of these nematodes in monkeys 
is apparently similar to that of the corresponding species in man. 
A third intestinal nematode was found in two specimens of Cercopithecus 
diana from the Du River, Liberia. Sandground finds that this parasite appears 
to belong to the genus Streptopharagus, of which four or possibly five species have 
been described. All of these with but one exception are parasites of primates. 
After a study of the material from the present monkeys he has decided that the 
parasite corresponds more closely with the species Streptopharagus pigmentatus 
v. Linstow than it does with any of the other species which have previously been 
reported from Macacus. No pathogenic action apparently can be attributed 
to this nematode. 
In another Colobus monkey (C. polykomos) two species of nematodes were 
found in the small intestine. One of these was Trichuris. The second nematode 
has been studied by Sandground, who has found it necessary to create a new 
genus and species for it. With reference to the systematic disposition of this 
parasite, he says that its characteristics cannot be reconciled with those of any 
known genus of the Strongyloidea. On the basis of the shape of the buccal 
cavity and the associated oral structures the status of the parasite would seem 
to fall between the two chief subfamilies, the Strongylinae and the Trichoneminae, 
but in other characteristics it exhibits affinities with the Oesophagostominae. 
The description of this parasite, Colobostrongylus strong: (Sandground), is given 
on page 469. 
In the small intestine of the monkey from which these parasites came there 
were observed a number of rounded plaques with shght thickening which sug- 
gested the possibility of an old Oesophagostomum infection. However, no distinct 
cysts were present. On account of the fact that these areas were so numerous, 
a hyperplasia concerning lymphoid tissue was thought of. In order to be sure no 
nematode was concerned in the lesions, a section of one of these areas was made 
and microscopically examined by Dr. Theiler. No parasites or ova were found. 
Pieces of the intestine of this monkey and of the spleen were fixed in Zenker’s 
solution. Examination of the stained sections shows that there are areas in 
the submucosa which stain deeply blue with a basic stain. Microscopical ex- 
amination reveals that these constitute lymph follicles which are considerably 
swollen and in which lymphoid cells have greatly proliferated. The hyperplasia 
of these follicles is apparently not associated in any way with nematode infec- 
tion. ‘They obviously were not concerned with Oesophagostomum. In another 
monkey that we secured in Africa in which Colobostrongylus was not encountered 
there was a rich Balantidiwm infection of the intestine. The surface of the mu- 
cous membrane in this instance showed considerable catarrhal inflammation in 
places, but in general appeared to be intact. There were no distinct ulcerations 
to be seen in the sections, but in a few places the mucous membrane had become 
eroded and the parasites had penetrated into these regions. There was also a 
very marked cellular infiltration of the mucous membrane, particularly with 
round cells and eosinophils which were very numerous. In some of the lymph 
follicles where the proliferation was very apparent, infusoria were found in the 
