36 THE SENSE OF TOUCH IN ANIMALS 



(b) Plantar surface. 



One well-marked interdigital eminence at base of D. 5 ; tibial 

 and central little raised. Long eminence on tibial border ; 

 longer one on fibular border. 

 P.R. ovate whorl on eminence at base of D. 5. 

 „ longitudinal at bases of D. 2, 3, 4. 



,, transverse, oblique and longitudinal on the long eminences 

 on tibial and fibular borders. 



Squirrel- MONKEY {Chrysothrix sciurea). 

 Hand,. (Fig. 22.) Digits long and well formed ; nails short, pointed. 

 {a) Digits. 

 P.R. longitudinal in ellipses on terminal phalanges. 

 „ second phalanges, transverse. 



„ proximal phalanges ; D. 1 loops open to radial side ; D. 2, 

 3, 4, 5 arches ; most marked on D. 2 and 5. 

 (6) Palmar surface. 



Three interdigital eminences ; one thenar ; one hypothenar. 

 P.R. wide ellipses on interdigital eminences, narro'W'ing towards 

 proximal end. 

 „ thenar eminence loops open in distal direction on distal 

 portion, and on proximal portion P.R. arched with arches 

 open in distal direction. 

 „ hypothenar eminence loops open to ulnar side. 

 Rest of palmar surface longitudinal. 

 Foot. (Fig 23.) Long and slender digits ; nails, pointed and long. 

 (a) Digits. 



P.R. longitudinal in ellipses on terminal phalanges. 

 „ D. \, proximal phalanx transverse. 



„ D. 2, 3, 4, 5, transverse on middle phalanges ; arches on proxi- 

 mal phalanges of all four, most marked on D. 4, 5. 

 (6) Plantar surface. 



Three interdigital eminences nearly fused into one large 

 eminence ; long tibial and longer fibular eminence. 

 P.R. longitudinal at bases of D. 2, 3. 

 „ loops open to fibular side at base of D. 5. 

 „ transverse on middle of fibular border of sole. 

 „ on proximal part of this eminence P.R. in. 

 „ loops open in proximal direction. 

 „ obhque at point of heel. 



Brown Sapajou {Cebus fatuellus). 

 Hand. (Fig. 24. ) Digits straight ; nails moderately long and pointed ; 

 palmar portion weU developed. 



