THE SKIN AND ITS APPEND AGES. 



371 



The papillae are large and very numerous around the arms, and pass by gradual, 

 transitionary stages into the ordinary papillae of the region. Further they may be 

 traced backwards along the anterior or extensor surface of the thigh, the upper surf?»ce 



Fig. 232. 



// 



■: 4 





-- a>»Po-»,ii,"TN2tiA? .'^ ''-'(!; /-•■'of 



I. Diagram to show the distribution of tlie temporary papillae in Kavui 



temporaiia ; after Huber. 



II, III. Vertical sections tlnough a temporary papilla ; after Huter. 



of the leg, foot, and fifth toe. Occasionally a few papillae were found on flexor sur- 

 faces of the third and fourth metatarsus, and very rarely were any discovered on the 

 fore-limbs. They occur in uo other batrachian of Germany (Huber). 



Each papilla (Fig. 232 II and III) consists of a heniispherical elevation of the 

 cutis, and is covered either by a layer of normal epidermis or in seme very rare cases 

 the epidermis was slightly thickened. The papilla consists of a firm connective-tissue 

 stroma, and is from o'2-o'4 mm. in height, o'4-o'5 mm. bread (after hardening in 

 alcohol). Such glands as exist in the papilla usually open laterally (Fig. 232 III), 

 and the blood-vessels are numerous. 



B b 2 



