26 THE SENSE OF TOUCH IN ANIMALS 



Foot. (Fig. 10.) Somewhat longer than hand ; digits rather longer ; 

 palmar portion strong and thick ; webbed ; strong, sharp nails. 



(a) Digits. 



P.R. terminal phalanges similar to those of terminal phalanges of 

 hand. 

 „ middle and proximal phalanges also similar to those of hand. 



(b) Plantar surface. 



Three interdigital eminences : one tibial, divided into two 

 portions ; one fibular eminence. 

 P.R. Interdigital eminence on fibular side ; wide ellipses. 

 „ central eminence on arches open in distal direction. 

 „ „ tibial side transverse. 



„ eminence on tibial border transverse on distal portion. 

 „ ,. „ arched open in proximal direction 



on proximal portion, merging 

 into tesselated arrangement. 

 „ eminence on fibular border, a few ridges in wide ellipse. 

 „ „ „ on distal portion, and on remain- 



ing portion ; all tesselated. 



Cape Sea Lion {Otaria pusilla). 



Foot. (Fig- IL) Skin black with faint greenish tinge. Digits and 

 plantar surface covered with wide coarse Papillary Ridges, most of 

 which are longitudinal, and on the central portion of the plantar surface 

 obliquely inclined on each side towards the median line of this surface. 

 \Vhen examined more closely the main ridges are divided by oblique 

 branching lines, as shown in the enlarged portion of skin at the side. 



Common Hedgehog {Erinaceus europoeus). 

 Hand. (Fig. 12.) Short thick digits, with long sharp nails ; thick fleshy 

 footpads, 

 (a) Digits. 



P.R. few and oblique on terminal phalanges of D. 1, 2, 3. 

 (6) Palmar surface. 



P.R. few and transverse on central and radial eminence ; radiating 

 on thenar and hypothenar eminences ; elsewhere absent. 

 Foot. (Fig. 13.) Elongated in shape, digits of variable length — D. 1 very 

 short ; D. 2, 3, 4 longer ; D. 5 short. Nails long, 

 (a) Digits. 



P.R. Terminal phalanges oblique on D. 2, 3, 4. 

 (6) Plantar surface. 



One large and one small interdigital eminence ; large, nearly 

 circular eminence on fibular side midway between heel and 

 clefts of digits ; on this eminence alone are P.R. in radiating 

 form. 



