396 PROCEEDINGS OF THE ACADEMY OF [1880. 



(2) Man, and some of the Rodents — the latter illustrated in 

 Erethizon — are exceptions to the tendency. In these forms the 

 temporal is distinct from the masseter. In the same order, as in 

 Coelogenys and Dasyprocta, tlie deep portion of the temporal is 

 either absent or represented in a single orbitally disposed mass of 

 vertical fibres. 



(3) The muscles in question have been much neglected. They 

 should be carefully dissected in all myological studies of the 

 mammalia. 



