174 ON" THE PAIRING OF TEGENARIA GUTONII. 



ejaciilatory duct Ed; F, F*, the attachments of two muscles with 

 the external skin a little in front of the ejaculatory duct. The 

 muscles run backwards to the inner corner of each opening of pul- 

 monary sac. X 75. 

 Fig. 14. Vertical longitudinal section of muscles AM. V S, ventrul surface ; Gr, 

 glands. X 75. 

 16. Papilla after pressure in glycerine. The fibres project. X 570. 



16. Eight papilla, as viewed from below. The scales are open, P. X 570. 



17. Vertical longitudinal section of papilla and fibres. X 570. 



18. Eight papilla, with scales and external portion of fibres removed. The 



Spider has been turned on its back, and the view is taken from behind 

 along the abdomen. X 670. 



19. Spermatozoa on the silken sheet ; A, the border of the sheet. X 570. 



20. Sheet on which spermatozoa were deposited, natural size. (Deranged.) 



21. Bursas copulatrices of female T. (tm^omm (hairs removed). B, chitinous 



band ; C B, B*, prolongations of band leading to spermatheca ; C, 

 thin skin ; E and E*, entrances to spermatheca. X 16. 



22. Biu'SEe copulatrices of female 7. Guyonii (hairs removed). The muscles 



&c. have been removed to show position of spermathecee. Letters as 

 above, the arrows point to the entrances of the spermathecEe. X 40. 



23. Sexual organ of immature female T. (T2{yomzrefen'ed toon p.l68. xl5. 



24. Vertical longitudinal section of muscle F,F* (fig. 13), showing the fibres 



/ which cause the depression on each side of the convexity of abdo- 

 minal sexual region, $ . V S, ventral surface. 



