574 ORGAN OF JACOBSON IN AN AUSTRALIAN BAT, 
the outer side. Both the upper and lower ends curve inwards 
slightly and suggesting the formation of a rudimentary turbinal. 
The organ itself on section is found to have the usual mammalian 
shape, though here the regular kidney-shape is slightly distorted, 
assuming more the Marsupial pattern. The inner wall is composed 
of the usual neurepithelium, the epithelial cells apparently having 
short cilia. The outer wall has epithelium with long cilia. A 
single small blood vessel runs parallel to the organ along the 
hollow of the outer wall — a feeble representative of the large 
vascular plexuses of Echidna and Ornithorhynchus, or even of the 
rabbit. Of mucous glands there are apparently none within the 
cartilaginous capsule, and no very abundant supply outside. A 
number of the septal glands towards the posterior part of the 
organ appear to supply it with fluid. The organ ends very 
abruptly. 
Stenson's cartilage is well developed, and passes inwards beneath 
the capsule of Jacobson, somewhat resembling the condition in 
Echidna. 
In conclusion the type of organ appears to be intermediate 
between that of the Marsupial and that of the Carnivore, though 
more nearly allied to the latter. As regards the relative size of 
the capsule of J acobson, it is larger than in any other mammal I 
know of, even larger than in Ornithorhynchus proportionally; in 
the larger animal, however, owing to the relatively smaller size 
of the cells, there must be a very much larger number of nerve 
elements. 
I must acknowledge my indebtedness to Messrs. Etheridge and 
Waite, of the Australian Museum, for identifying for me the bat; 
and also to Dr. Elliott Smith who not only called my attention 
to the paper by Duval and Garnault, but most kindly made for 
me a manuscript copy of the paper, which I could not otherwise 
have had an opportunity of seeing. 
