NERVOUS SYSTEM. VERTEBRATA. 269 



sylvian emerges from the " Sylvian fissure " at about its 

 mid-point. 0. C. 1325 s. 



Flower, Proc. Zool. Soc. 1870, p. 763. 



D. 346. The brain of a Panda (Ailurus fulgens). 



The small precrucial sulci (and consequently Mivart's 

 " Ursine lozenge ") are well marked in this specimen. 



So much of the posterior ectosylvian sulcus is exposed 

 that it appears to join the apex of the " Sylvian fissure." 



0. C. 1325 s b. 

 Mivart, Journ. Linn. Soc. 5 vol. xix. 1886, p. 12. 



D. 347. A cast of the cranial cavity of a Panda (Ailurus fulgens). 

 Note especially the deep broad depression corresponding 

 to a part of the submerged first arcuate gyrus in the Sylvian 

 region. 



D. 348. The brain of a Kinkajou (Potos caudivolvulus) , 



The Sylvian region is very instructive in this brain. 

 The " Sylvian trigone," or depressed area, can be partly 

 seen, and behind it a large part of the posterior limb of the 

 first arcuate gyrus makes its appearance. It is limited by 

 the posterior ectosylvian sulcus, which appears to join the 

 apex of the Sylvian fissure. The suprasylvian arc is 

 complete, simple, and regular. 



The conjoined postlateral and lateral sulci form a great 

 arc which passes directly into the ansate in front. The 

 large simple coronal sulcus is quite independent. There is 

 a large very obliquely-placed crucial sulcus passing directly 

 into the intercalary prolongation of the calcarine (splenial), 

 as in the Cynoidea. 



A faintly-marked notch in the anterior lip of the right 

 crucial is the only indication of a precrucial sulcus. 



0. C. 1325s a. 



Mivart, Journ. Linn. Soc., vol. xix. 1886, p. 13. 



Family HUSTELID^E. 



D. 349. The brains of a Weasel (Putorius vulgaris) and of a Stoat 

 or Ermine (Putorius ermineus). 



It is very significant that in spite of the diminutive size 

 of these brains for they are much smaller than many 



