196 
JOURNAL OF MAMMALOGY 
In one juvenile male orang, in the National Zoo, one can feel the 
glandular body, which is approximately the size of a pea, beneath the 
pit. After some palpation a tiny drop of apparently crystal fluid 
exudes from the opening. 
In conclusion it niay be stated that during the examination of a con- 
siderable number of preserved bodies of fetuses and adults of many 
different species of monkeys and apes no trace of anything comparable 
to this sternal gland in the orang-utan was found. It seems certain 
that this gland is not present in the adult chimpanzee, gorilla or gibbon, 
nor in the last mentioned in a fetal stage. It is impossible at present 
to say what purpose the sternal gland in the orang may serve. The 
odor of its secretion and the time of its maximum functioning would 
probably throw hght on this question. An accumulation and concen- 
tration of glands in the region of the chest is known to occur in mar- 
supials {Myrmecobius, Didelphis, Trichosurus, and Petaurus), where 
their opening lies for the most part in a hairless region. Some forms 
of Chiroptera hkewise have large glands in the middle of the chest. 
In these mammals also, the glands are more strongly developed in, or 
even entirely restricted to the male. 
Carnegie Institution of Washington^ Dept, of Embryology, Baltimore, Md, 
