ANIMAL PARASITIC INFECTIONS 421 
follicles or about them and in some instances the nuclei of the infusoria were 
seen, the surrounding protoplasm of the parasite having disappeared. The 
parasites were also found deep in the submucosa, sometimes in clusters and along 
the intramuscular septa. It is impossible not to associate the lymphoid hyper- 
plasia to some extent with the Balantidiwm in this case, though it must be ad- 
mitted that since such lymphoid hyperplasia is often not present in balantidial 
infection in other animals or in man, and since there was similar, though less ex- 
tensive lymphoid hyperplasia in the monkey infected with Colobostrongylus, 
both of these animals in question may have possessed special predilection to 
proliferation of lymphoid tissue, under the influence of slightly irritating con- 
ditions. Unfortunately no sections from the other organs of this animal were 
preserved and the spleen tissue appears to have been lost in some way among the 
very large amount of material collected in Africa during the year. Fox! has 
recently encountered, in a necropsy upon a monkey, a great overgrowth of lym- 
phatic tissue which in the absence of any definite tumor suggested a diagnosis of 
chronic lymphatic leukemia. However, lymphatic leukemia was not suggested 
by the blood examination of the two monkeys to which we have just referred. 
Parasites of Man Infecting Monkeys. Among the more important helminthic 
parasites of man which have been noted occasionally to occur in monkeys, or 
vice versa, are the following: 
Trematoda: Schistosoma haematobium in Cercocebus fuliginosus; Watsonius 
watsont in Cercopithecus callitrichus. 
Cestoda: Bertiella satyri (= B. studeri) in Cynomolgus sinicus, C. fascicularis, 
Cercopithecus pygerythrus, C. schmidti, Hylobates hooloch and in Simia satyrus 
(=Pongo pygmaeus); the pleropercoid larva of Diphyllobothrium mansoni in 
Macacus nemestrinus, M. furcatus and Cynomolgus fascicularis; the larva of 
Multiceps multiceps in Macacus rhesus, M. silenus, etc.; the larva of Echinococcus 
granulosus in Macacus innuus ( = sylvanus), M. rhesus, Papio porcarius, Cynomol- 
gus fascicularis (= Macacus cynomolgus), ete.; Cysticercus cellulosae in Cercopithe- 
aus cephus, C. patas (= Simia rubra), Macacus inuus. 
Nematoda: Trichocephalus (= Trichuris) trichiura in various Old-World 
monkeys; O¢esophagostomum brumpti in Macacus rhesus and Cercopithecus 
callitrichus; O. stephanostomum in Pan satyrus; Ternidens diminutus in Cyno- 
molgus sinicus, C. fascicularis, Macacus cynomolgus and Gorilla beringei; Necator 
americanus in Cercopithecus ruber, C. patas, Pan (= Simia) satyrus and Gorilla 
beringei; Ancylostoma duodenale in Macacus sinicus; Strongyloides intestinalis in 
Stlenus (= Macacus = Pithecus = Cynomolgus) philippinensis, Pan troglodytes, 
Pongo pygmaeus, Silenus (irus, cynomolgus, nemestrinus, rhesus, sinicus), Cer- 
copithecus (species), Cynocephalus (species); Trichostrongylus colubriformis in 
Papio hamadryas; Physaloptera mordens in Macacus sinicus; Acanthocheilonema 
perstans in Pan satyrus; Fiillebornius medinensis in the baboon, Papio cynocepha- 
lus, Papio hamadryas, and Cercopithecus callitrichus; Ascaris lumbricoides in Pan 
satyrus; Filaria loa in Papio (species); Gongylonema in Macacus (sylvanus s. 
inuus) and Silenus (sinicus). 
1 Fox: Zoological Society of Philadelphia. 57th Annual Report. (1929), p. 44. 
