CEREBllAL CONVOLUTIONS OF THE CARNIYOEA, 7 



sulcus between them. The crucial sulcus is altogether absent 

 from the cerebral surface; nevertheless the calloso-marginal 

 sulcus is continued forward to the place where the crucial sulcus 

 exists in most Carnivora, thus separating the hip)pocampal and 

 sagittal gyri behind that point. The brain of liemigalea agrees 

 with that of Fm^adoxurus. 



Arctictis. — The Binturong * has a brain similar to that of 

 FaradoxuTus, save that the sagittal and parietal gyri are sepa- 

 rated posteriorly for a longer space, that the crucial sulcus is 

 distinct though small, and that the sagittal gyrus is complicated 

 by certain additional depressions. 



Oynocjale. — The brain of this animal is only known to me by 

 Professor P. Gervais's figure of the cast of the inside of its skull t, 

 which shows the cranial convolutions with exceptional distinct- 

 ness. There is no crucial sulcus. The parietal sulcus, like that 

 of every carnivorous animal not of the Dog group, does not bifur- 

 cate posteriorly. The hinder limb of the Sylvian gyrus shows no 

 indication of subdivision, and the Sylvian lissure is described as 

 " Tongue et ohliqtie en arriereT The most marked peculiarity of 

 this brain is the great expansion of the parietal gyrus at its 

 anterior end, this expanded part being longitudinally grooved 

 with short secondary grooves radiating from the longitudinal 

 one. 



Eupleres. — This very exceptional and insectivorous-like Carni- 

 vore % is unfortunately, so far as I know, undescribed, save as 

 regards the cast of the interior of the skull §. It appears to have 

 the Sylvian gyrus formed as in Paradoxuriis. There is no crucial 

 sulcus visible, and the parietal gyrus does not bifurcate posteriorly. 

 The most striking character shown by the figure of this cast is 

 the very great breadth of the sagittal gyrus. 



Herpestes. — The Mongooses have been placed in a category by 

 themselves, as regards their cerebral structure, by MM. Leuret 

 and Gratiolet ||, on account of the apparently anomalous com- 

 plexity of structure presented by at least some forms of this 

 extensive genus. There appear to be sometimes as many as five 



* See P. Gervais, p. 129, aucl plate Tii. fig. 13, -wbich represents a cast of tlie 

 inside of the skull. See also P. Z. S. 1882, p. 616 ; but see especially Garrcd, 

 P. Z. S. 1873, p. 201, where a -view of the side of the brain is given. 



t See I. c. p. 128, plate vii. fig. 8. 



X For its peculiarities, see P. Z. S. 1882, p. 189. 



§ See P. Gervais, I. c. p. 130, pi. vii. fig. 2. 



II See /. c. p. 383. 



