1883.] 



ANATOMY OF StTS SALVANITJS. 



417 



anterior process QSa) running forwards and downwards into the rhinal 

 fissure, while the processus accessorius (sac) points backwards and 

 upwards. Rising from the anterior jiortion of the rhinal fissure and 

 running upwards and forwards is the presylvian fissure (Ps), a 

 well-marked fissure symmetrical on both sides. Above the rhinal 



Fis. 2. 



Lateral view, left side ; natural size. 



fissure, and running in a direction more or less parallel to it, is the 

 suprasylvian fissure, which shows a curious asymmetry on both sides 

 (figs. 1, 2, and 3) : on the right side (figs. 2 and 3) it begins by the 



View from above : natural size. 



union of two short branches— that nearest the mesial line called the 

 processus posticus (ssp), the other, more external, named the pro- 

 cessus descendcns {ssd), — and extends forwards to the liue of the 

 sylvian fissure (ss) ; at this point it gives off an ascending branch (sss), 



