CEEEBEAL CONYOLUTIONS OF THE CABTSTIVORA. 17 



Fig. 6. 



Fig. 7. 



Fig. 6. Dorsal surface of brain of Grisonia, natural size. C. Crucial sulcus . 



BH. E.hinencepbalon. pc. Preerucial sulcus. 8a. Sagittal gyrus. 

 Fig. 7. Lateral view of brain of Grisonia, natural size. C. Crucial sulcus. 



P. Parietal gyrus. JRH. Ebinencephalon. S. Sylvian gyrus. Sa. 



Sagittal gyrus. 8f. Sylvian fissure. 



Gulo. — The brain of this animal is only known to me through 

 the description and figure of the cast of the inside of its skull given 

 by Professor Gervais *. He says : — " Je n'y retrouve pas, du 

 moins sur le moule intra-crauium, le dedoublement des deux 

 circonvolutions superieurs caracteristiques du Galictis tar- 



The cast shows signs of tbe presence of an " Ursine lozenge," 

 which seems to be much, elongated antero-posteriorly ; also of a 

 greatly expanded and convoluted anterior limb to the sagittal 

 gyrus, as well as of a longitudinal grooving of its middle and hinder 

 part. I can say nothing, of course, as to the inter-relations 

 between the hippocampal and sagittal gyri. 



Mustela. — The Martens and Weasels f have that more simple 



* See I. c. p. 145, pi. vi. fig. 7. 



t See Leuret, I. c. p. 381, pi. vi. ; and P. Gervais, p. 143, pi. vi. fig. 3 (inter- 

 cranial cast) ; see also Krueg, I. c. pi. xxxvi. 



LINN. JOUEN. — ZOOLOGY, YOL. XIX. 2 



