36i> 



MOEBID ANATOMY Or THE SKIN. 



the same sort of appearance. On careful examination, each of 

 the longitudinal grooves or furro\YS is found to correspond to a 

 single cutaneous papilla — which is not ahvays elongated ; the 

 horn as a whole springing from a group of papilla3 as its base, so 

 that in this respect its structure agrees perfectly with that of an 

 ichthyotic scale. V^e meet with horns, however, which are not 

 of uniform thickness throughout, but conical, tapering to a point. 

 There is an exquisite specimen of this variety too in the Bonn 



:pm 



a. Cutaneous Lorn 1' inclics long, from tlic coilecticii of the 

 Pachological Institute at Bonn. Natural size, after 0. Weher. 

 h. Another Lorn in tlic same collection, natural size. 



collection (fig. llj). The rarljcr abrupt increase in diameter as 

 >vc approach the base of tljo horn, is due to the progressive 

 addition of ]iew horny ]amel]a\ whicli overlie one another in 

 an imbricate manner. Each of these lamellre again is made up of a 

 series of elongated prisms, corresponding to single papillse ; it is 

 only at the extreme periphery that we can obtain by maceration 

 true Liraelloe. which exhibit the papillary moulding in somewhat 



