MOULTING HABITS OF SPIDERS. 



Ill 



While these things take place, one of the inferior trichogenous cells of 

 the matrix (nw.hcl) augments in size and stretches itself in the direction 

 of the hair tube (tu.oh) in the form of a light papilla (nw.hcl), which 

 originates the new hair. Some time thereafter this papilla ensheaths itself 

 within the cavity of the old hair tube, perforating the layer of the matrix 

 (mtx) situated above it. 



Sometimes, near the extremity of the new hair, as is shown in Fig. 68 

 (tu.oh), one sees also the unsheathed tip of the new 

 hair (nw.hr) standing up freely, and the remainder 



FIG. 68. 



Fio. 70. 



FIG. 68. New hair, nw.hr, shown within its old sheath, tu.oh, the tip exposed, and the base of the moult, 

 mlt, pushed off. FIG. 69. Tip of new hair shown within the old sheath before moulting. FIG. 70. Sec- 

 tion showing the origin of a new hair (after Wagner) ; in.lr.cto, inferior layer of old cuticle, ct.o ; Iq, 

 liquid filling interval ; tu.oh, tube or sheath of the old hair ; ch.lr, chitinous layer ; nw.hcl, new hair 

 cell ; mtx, matrix ; rt.nw.hr, root of new hair. References uniform in the figures. 



thereof enclosed within the sheath. At the same time is seen the pubes- 

 cence upon the new hair, and its root (rt.nw.hr, Fig. 68). The relations 

 of the tip of the hair to the old tegument are shown at Fig. 69. At this 

 epocli the liquid (Iq, Fig. 70), which filled the space between the old and 

 new skin, disappears ; afterward the sheath of the new hair breaks and 

 is seen entirely formed under the old skin. 



