504 



Comparative Animal Physiology 



Sensory hair-, 



p.can. 



.-Covering cell 

 ,, Sensory cell 



Supporting 

 epithelial 

 cell 



^ Cir mus. 



4 V ■'-'/-'-*// 



Sensory nerve fiber 



Fig. 175. Epithelial sense organ of earthworm. From Langdon. 



.(V.^.-,,;.A Terminal 



%>' A yW arboriz,aticn 







erve fiber 

 in core 



y.Endothelial cells 

 of lamellae 



Central channel 



Fig. 176. Section of pacinian corpuscle of cat mesentery, a, Terminal arborization; n, 

 nerve fiber in core; f, central channel; c, d, endotheHal cells of lamellae. From Schafer." 



