'21(J PHYSIOLOGICAL SERIES. 



ralourine (splenial) sulcus, but, in reality, the two sulci are 

 often entirely separate. There is a deep precrucial sulcus, 

 which extends on to the mesial wall in some cases, as it 

 does here. 



Just as in certain anomalous cases in the Felidae and in 

 all cases in the Hygenidse, the anterior part of the first 

 arcuate gyrus of Leuret becomes buried in the u Sylvian 

 fissure," so in this brain the anterior of the second arcuate 

 gyrus also tends to become buried in this great Sylvian 

 cleft, which has already swallowed the whole of the lirst 

 arcuate gyrus. Hence, in many cases, the upper part of the 

 suprasylvian sulcus appears to join the " Sylvian fissure/' 

 while the postsylvian (posterior suprnsylvian) remains 

 exposed. 



The great elongation of the l( Sylvian fissure " in the 

 Badger, as in the Arctoidea in general, is to be attributed 

 to a factor such as that which elongates the corresponding 

 fissure in the Hyaena and sometimes in the Lion. The first 

 arcuate gyrus is buried in the " Sylvian " and the small 

 " feline Sylvian " is found in the triangular submerged 

 area. 



The large orbital (presylvian) sulcus joins the prorean, 

 and also frequently gives off a more lateral accessory 

 prorean branch. 



In this brain the gap between the coronal and lateral 

 sulci is complicated by a triradiate compensatory ansate 

 sulcus ; but in other cases the conjoint corono-lateral gives 

 off numerous short branches in this region. 



Flatau and Jacobsohn, Vergl. Anat. d. Centraln. 18U9. 



D. 358. A cast of the cranial cavity of a Badger (Mtle* meles). 



Besides showing the true shape and proportions of the 

 cerebellum, olfactory bulbs, and cerebral hemisphere, this 

 specimen clearly exhibits the arrangement of the chief 

 sulci. 



D. 359. A cast of the cranial cavity of the Common Otter ( I.nfra 

 lutra). 



The most noteworthy feature of this cast is the demon- 

 stration of the small size of the olfactory bulbs and the 



