Organs of Touch, 139 



OEGANS OF SPECIAL SENSE. 



A. Organs of Touch. 



There are but few examples of the special adaptation of 

 parts for tactile exploration ; such, however, may be noted 

 in the shape of tactile 2^cipillcB on the fingers or tail, or on tho 

 naked terminal integument of the nose, especially when pro- 

 duced as a snout or proboscis ; or again in the form of 

 vibrisscB (that is, hairs so connected by their sclerous basal 

 capsule and bulbs with sensory nerve filaments, as to receive 

 very delicate impressions by contact with extraneous objects 

 or impulse), which are commonly found on the upper or 

 lower lips, and at the angles of the mouth : or, lastly, as 

 expansions of highly sensitive membrane, in the shape of 

 wings, ear-conchs, &c. 



Special. 



Tactile Papillce. 



In Man the broad tips of the fingers are richly supplied with 

 penicellate plexuses of nerves, the terminations of which occupy 

 each the centre of a papilla. 



In Quadrumana, tactile papillae are developed on the fingers and 

 on the prehensile tail (when present, e.ff. Ateles). 



In the Shrew, Mole, Elephant, Tapir, and Pig, these papillae are 

 specially developed on the produced exploratory snout. 



JExpansions of Membrane. 



The extent of surface and delicate organisation of the parts of the 

 skin forming the wings and ear-conchs of those of the Bat tribe that 



