1905.] ox THE ANATOMY OF THE FERRET-BADGER. 21 



2. Some Notes upon the Anatomy of the Ferret-Badger^ 

 Helictis personata. By Frank E. Beddard, M.A., 

 F.R.S.^ Prosector to the Society. " 



[Received March 21, 1905.] 

 (Text-figm-es 7-12.) 



The dissection of a female example of Helictis personata, which 

 was acquired by the Society on the 4th and died on the 14th 

 November, 1904, enables me to lay before the Society some new 

 facts in the anatomy of this genus of Carnivora. 



So far as I am aware, the only zoologist who has investigated the 

 anatomy of the soft parts of the genus Helictis is the late Prof. 

 Gan'od *, whose memoir deals with the essentials in its structure. 

 The species examined by him was Helictis subaurantiaca. It is 

 not therefore unnecessary to report upon the anatomy of another 

 species, though the differences between the two are, as might be 

 expected, but slight. I deal, moreover, with a few points upon 

 which Prof. Garrod did not touch in his account. 



§ Brain. 



The brain of Helictis suhaurantiaca has been described and 

 figured (in dorsal and lateral view) by Prof. Garrod in his memoir 

 already referred tot. The figure of the bi'ainof Helictis personata 

 submitted herewith (text-fig. 7, p. 22) shows certain differences, 

 Avhich I regard as worthy of record in view of the little knowledge 

 which we possess upon the matter. 



The most salient difierence which this brain shows from that of 

 H. suhaurantiaca is the very slight appearance upon the dorsal 

 surface of the intercalary prolongation of the ealcarine sulcus. 

 This furrow, as will be seen in the figure (text-fig. 7), only 

 appears dorsally for a short distance quite at the posterior end of 

 the hemispheres, and also of course anteriorly where the two sulci 

 join the crucial sulci. 



The precrucial sulcus in my specimen is not so fully developed, 

 particularly upon the left side (text-fig. 7, Pc.S.), as in Garrod's 

 specimen of Helictis suhaurantiaca. It does not entirely delimit 

 the lu'sine lozenge in front. 



The Sylvian fissure on both sides of the brain joins the supra- 

 sylvian,the gyi'us anterior to the Sylvian being apparently depressed 

 below the surface of the hemispheres. There is a hint of this in 

 Garrod's figure, but hardly in that of Dr. Elliot Smith, though it 

 refers, I imagine, to the same brain. The remaining fissures agree 

 absolutely with those of Helictis suhaurantiaca. I pass on therefore 



* " Notes on the Auatomj' of Helictis siilaurantiaca" P. Z. S. 1879, p. 305. 

 t This braiu is also figured in the Catalogue Physiol. Series Koy. Coll. Surgeons, 

 vol. ii. (2nd ed.) p. 273, by Dr. Elliot Smith. 



