120 THE SENSE OF TOUCH IN ANIMALS 



ill-defined, with a slight distal imbrication, thick, short Drlisen- 

 leisten, and papillae of the corium somewhat indefinite. 



Cynopithecus niger (Figs. 140, 141). — Longitudinal sections 

 from middle and terminal phalanges of D. 4 and D. 5, the former 

 with distal imbrication of the papillary ridges, coiled sweat- 

 ducts extending from the free surface of the epidermis, and 

 irregular Driisenleisten and papillae of the corium. 



Macacus inuus (Fig. 142). — Longitudinal section from tip 

 of terminal phalanx of a digit of the hind foot. Papillary 

 ridges proximally imbricated and Driisenleisten small, papillae 

 of the corium prominent and wide. 



Ceercocbus collaris (Fig. 144). — Longitudinal section through 

 tip of terminal phalanx of a digit of the forefoot. Papillary 

 ridges somewhat indefinite, Driisenleisten and papillae of the 

 corium well developed. 



Cercopithecus diana (Fig. 145). — Transverse section through 

 terminal phalanx of a digit of the hind foot. Papillary ridges, 

 Driisenleisten, and papillae of the corium well developed, 

 especially the two former. 



Cercopithecus callitrichus (Figs. 146, 147) are microphoto- 

 graph and dra^ving of the same longitudinal section. Papillary 

 ridges clear and large, and with proximal imbrication, the 

 Driisenleisten and papillae of the corium moderately 

 developed. 



Fig. 148. — Longitudinal section through terminal phalanx 

 of a digit of the hind foot. Papillary ridges large and shghtly 

 imbricated in a proximal direction, thick, large Driisenleisten 

 and pointed papilla3 of the corium. 



Fig. 149. — Longitudinal section through an interdigital pad on 

 the plantar surface of the hind foot. Paj)illary ridges pointed 

 and very much imbricated in a distal direction, Driisenleisten 

 small, papillae of the corium low. 



SIMIIDiE. Hylohates lar (Fig. 150). — Longitudinal section 

 through terminal phalanx at tip of a digit of the hind foot, and 

 (Fig. 151) transverse section through plantar surface. Both 

 show well-marked papillary ridges (Fig. 150), pointed Driisen- 

 leisten and papillae of the corium (Fig. 151), larger Driisenleisten 



