1880.] NATURAL SCIENCES OF PHILADELPHIA. 387 



111 the horse a baaall superficial slip of the temporal exists, 

 which does not conceal the main tendon. 



In the lion (PL 143 and 144, fig. 2) the parts marked vertico- 

 soufien and jugo-soutien answer in position to the superficial and 

 snpra-zygomatic fasiculi. The slips are identified, however, with 

 the muscles of the external ear. 



In the description of the myology of Erinaceus ecaudatiis the 

 authors use the following language : " Between the crotophj'toe 

 (temporal) and the masseter muscles in the position of the absent 

 malar bone a red muscle-fasicle is seen, Avhich we have been un- 

 able to identify. It is lost posteriorly upon the <-emporal aponeu- 

 rosis, and passes under the masseter to be i .serted upon the 

 anterior border of the ascending ramus of the mandible." 



I do not hesitate to classify this slip with the supra-zygomatic 

 slip of the masseter (see fig. 2, PI. TT of C & L.). Nothing to 

 invalidate such identification can be presented excepting the fact 

 that the slip has an alleged origin from the temporal aponeurosis. 

 It is in every way likely that either the glistening main tendon or 

 the aponeurotic texture of the superficial portion of the temporal 

 is here described. 



In the above descriptions no mention is made of the union of 

 temporal and masseter except in 'the ant-eater, and in none is the 

 method of description the same as employed in this paper. 



In making the dissections it was found convenient, after prepar- 

 ing the superficies, to dissect the masseter as far as the retention of 

 the zygomatic arch in position would permit. Then this arch was 

 sawn through at either end, and turned down. This exhibited the 

 continuity of the fibres attached to it, and the temporal. The 

 latter muscle was then studied carefully. After this the head was 

 sawed through from right to left vertically (frontal cut) in order to 

 expose the arrangement of fibres on the median aspect of mandible 

 in rodents, or, in lieu of this, an antero-posterior section was made. 



Attention will now be invited to the detailed arrangement of 

 the parts in ditferent mammalian types. 



In Macacus nemestrinus we find the fibres of aponeurotic origin 

 (superficial fibres) arising as in man. In addition, a slip of fibres, 

 arising from the inner surface of the malar bone and the occipital 

 crest, passes forward and obliquely downward, to be continuous 

 with the deep masseteric fibres. This slip is the supra-zj-gomatic, 

 and is believed to be an upward prolongation of the deep 



