lo Journal of Comparative Neurology. 



Other fissures are nearly always found upon this area. 

 The cephalic portion of the insula is divided sometimes into as 

 many as three gyres but these divisions are not believed to be 

 constant, and in the pig, as in the sheep, owing to its compar- 

 atively simple character, these .individual differences are very 

 striking. The fissures as a rule grow deeper as they approach 

 the meson and the cephalic portion of the insula does not 

 extend as far as laterad as the rest. 



DESCRIPTION OF PLATE I. 



Fig. I. Lateral aspect of the Left Ilemicerebrum of a Pig, (after Turner), 

 r, rhinal fissure ; s, Sylvan fissure. 



Fig. 2. Right Hemicerebrum of Pig. No. 13; x 2^. In, Insula; Sy, 

 Sylvian Fissure ; Rh, Rhinal Fissure ; Olf, Olfactory Tract. 



Fig. J. Lateral aspect of Left Half Brain of Pig (after Huxley). Sy, Syl- 

 vian Fissure ; In, Insula. 



Fig. 4. Lateral Aspect of Right Half of Brain of Pig. No 17 ; x % 

 Rh, Rhinal Fissure ; Sy, Sylvian Fissure ; Olf, Olfactory Tract ; Op, Optic 

 Nerve. 



Fig. £. Left Hemicerebrum of Pig. No. 12; x 2^. Olfactory bulb re- 

 moved. Olf, Olfactory Tract ; In, Insula. 



Fig. 6. Left Hemicerebrum of Pig, showing Insula as seen when the Dorso- 

 lateral overlapping portions are removed. Olfactory Bulb removed No. 13 > 

 X 2^. In. Insula; T, Union of Insula with Temporal Lobe; Olf, Olfactory 

 Tract. 



Fig. ■/. Right Hemicerebrum of Pig. No. 9 ; x 2^3. In, Insula; C, Cir- 

 cuminsular Fissure; R, Rhinal Fissure. 



Fig. S. Left Hemicerebrum of Pig, showing Insula as viewed from dorso- 

 lateral aspect. No. 9; x y^. In, Insula; Olf, Olfactory Tract. 



Fig. g. Right Hemicerebrum of Brain of Pig. No. 9 ; x ^. In, Insula. 



Fig. 10. Left Hemicerebrum of Pig. No. 17; x 7^. In, Insula; Olf, 

 Olfactory Tract. 



