xlviii Journal of Comparative Neurology. 



"Not all vertebrates, not even a majority of them, possess a 

 cochlea, consequently we should have to provide another name for 

 same nerve in lower forms or else have the anomaly of an animal 

 without a cochlea provided with a ' cochlear nerve.' In every aspect 

 of the matter the sense-organ must be present before its nerve can 

 have a separate existence. The terms ' utricularis ' and ' saccularis ' 

 are in all respects suitable and descriptive of the things to be named. 

 Both of the nerves to which they are applied supply parts of the same 

 organ complex which forms a well differentiated structure, and since 

 both parts must have very similar functions it is certainly unadvisable 

 to leave out of the designation all reference to the accepted idea as to 

 the function which they subserve. Consequently, 1 hold that the 

 names which I used in my memoir on the ear are the most suitable 

 and the best grounded terms yet proposed for a revised nomenclature. 

 The names may be used in full as Nervus acusticus utricularis and 

 Nervus acusticus saccularis, or abbreviated to N. ac. utric. and N. ac. 

 sac, or, since they are not liable to become confused with other nerve 

 names, we may write simply N. utric. and N. sac. For the branches 

 of each of these nerves we may write respectively : 



i ramus cristas anterioris. 

 N. utric. -^ " " externas. 



(^ " maculae utriculi. 



C ramus cristpe posterioris. 

 N. sac. -| " " cochlearis. 

 ( " maculae sacculi." 



"Sense of Boundary." 



In a note in Science (April 7, 1893), Mr. F. Tuckerman gives 

 an interesting instance where two dogs belonging to adjacent estates 

 and which were implacably hostile, showed a very accurate knowledge 

 of the dividing line between the two properties where it was indicated 

 simply by two mconspicuous stone posts. The only explanation the 

 writer offers is " that dogs possess a very acute sense of boundary." 

 In the interests of accuracy we protest against the use of this term. 

 Sense of direction is bad enough, while no one probably believes in 

 the existence of such a sense in the meaning of " sense" applied to 

 the sense of smell or of hearing. It would be almost as accurate to 

 ascribe a sense of " setting " or a sense of herding to dogs with these 

 acquired instincts as to refer to a " sense of boundary." 



