368 PHYSIOLOGICAL SERIES. 



conversion of the latter into the Primate or true Sylvian 

 fissure;. The separate postsylvian sulcus (see the left 

 hemisphere of D. 531) is clearly the representative of the 

 "parallel sulcus" of Human Anatomy. And the supra- 

 sylvian sulcus, which has absorbed, or become merged in, 

 certain inconstant kinks above the bend of the rhinal fissure 

 which in the Carnivora and Ungulata would be culled 

 " Sylvian fissure," now becomes the true " Sylvian fissure." 



Fig. 212. (Nat. size.) 



SULC. INTERCAL. 

 I 



SULC ROS. 





HIP. TUBER. OLF. TUBER. 



Fig. 213. (Slightly enlarged.) 



CALCAR." 



OLF. BULB. 



This process of blending of suprasylvian sulcus and what 

 may be called the " feline Sylvian fissure," will be the better 

 appreciated it' the reader studies the varied analogous phe- 

 nomena exhibited by AfyrmecopJiaga (vide supra), 

 (vide supra), and (in a different manner) the Seals 

 supra). In the case of the Lemurs the ventral parts <!' 

 this Svlvian fissure may be absent so that it does not 

 join the rhinal fissure and is practically the homologuo of 

 the suprasylvian sulcus, purr and simple (fig. 213). In other 



