Clark, Comparative Anatomy of the Insula. 99 



PLATE X. 



Fig. y. Lateral aspect of the right insula of chimpanzee, supposed age 4 

 years, female, 265; x i. The operculums have been cut away. 



Fig. 8. Lateral aspect of the right insula of a macaque monkey, age and 

 sex unknown ; x i. The lateral portion of the cerebrum was removed to the 

 level of the ventral half of the circuminsular fissure. The remainder of the 

 insula was exposed by cutting a groove parallel with the Sylvian fissure. 



Fig. g. Lateral aspect of the left insula of a seal {Phoca vitulina); x I. 

 Operculums cut away. The black areas at the dorsal and ventral ends indicate 

 broken surfaces where the parietes were removed, and are too black. 



Fig. 10. Lateral aspect of the left insula of a panther {Felis concolor), fe- 

 male, 18 years old, 309; x i. Operculums cut away. 



Fig. II. Lateral aspect of the right insula of an adult raccoon (Procyon 

 lotor), male, age unknown, 2031 ; x i. The overlapping portions have been re- 

 moved. 



Fig. 12, Diagram of the same, showing the relation of the Sylvian and 

 transinsular fissures. 



Fig. ij. Lateral aspect of the right insula of a Thibet bear [Ursus thibet- 

 iantis), male, age at least 5 years; 645; x i. Shows well the relation of the 

 transinsular and Sylvian fissures. 



Fig. 14. Lateral aspect of insular region of a dog (cross between French 

 poodle and Skye terrier), age more than 18 years, sex unknown, 166; x i. 

 Shows the exposure of the insula before dissection. 



Fig. /J. Lateral aspect of the insula of the same with the operculums cut 

 away ; x i ^4. 



Fig. lb. Lateral aspect of the right insula of a dog (Canis fainiliaris), age 

 unknown, probably adult, male; x i. 



Fig. 17. Outline of a section of the above looking dorsad ; x i. The 

 dotted brace indicates the extent of the insula. 



TLATE XL 



Fig. iS. Transection of the cerebrum of a dog (C. familiaris) , male, age 

 a few weeks, 3124 ; x 2}^. Section made according to Weigert's method, after 

 hardening the brain in 30^ and 5^ bichromate of potassium, imbedded in collo- 

 dion and cut in oil ; differentiates alba and cinerea. 



Ftg. ig. Transection (Weigert) of a portion of the left cerebrum across the 

 Sylvian fissure of a cat (Felis do?nestica), age and sex unknown ; x 2J^. 



Fig. 20. Transection (Weigert) of a portion of the right cerebrum across 

 the Sylvian fissure of a skunk [Mephitis mephitica), age a^d sex unknown ; x 2j^. 



Fig. 34. Transection of the right insular region of a sheep (Ovis aries), 

 age and sex unknown, looking cephalad ; x 4)^. 



PLATE XII. 



Fig. 21. Lateral aspect of the left insula of an elephant [Elephas indicus), 

 age unknown, female, 2181 ; x i. Overlapping portions have been dissected 

 away. 



