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 



o 



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 Ortiithorhynchus, 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 Jacobson, it is larger than in any other mammal I 

 know of, even larger than in Oniithorhynchus 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 mj 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. 



