Physiology of t lie Araneidea. 175 



responding parts of the left posterior leg, but the tibia, metatar- 

 sus and tarsus were small. 



8. The left posterior leg of an immature female Tegenaria 

 civilis was amputated near the anterior extremity of the tibia on 

 the 16th of March 1846. On the 30th of the following May 

 the spider cast its integument and the mutilated limb was repro- 

 duced; the coxa, femur and genual joint were of the same size 

 as the corresponding parts of the right posterior leg, but the 

 tibia, metatarsus and tarsus were small. This spider moulted 

 again on the 27th of June in the same year, when a considerable 

 enlargement of the tibia, metatarsus and tarsus of the new limb 

 took place. 



9. A very young female Tegenaria civilis had the left posterior 

 leg detached at the coxa on the 14th of September 1846. It 

 moulted on the 23rd of the same month, but the mutilated leg 

 was not reproduced till a subsequent moult, which took place 

 on the 4th of May 1847. The same leg was detached at the 

 coxa on the 13th of May, the 24th of June, the 22nd of July, 

 the 30th of August, and the 13th of October ; and the spider 

 changed its integument on the 16th of June, the 16th of July, 

 the 22nd of August, the 6th of October, and the 24th of Novem- 

 ber 1847, respectively, at which periods the left posterior leg 

 was reproduced. Though this limb was restored six times, and 

 was enlarged at each successive moult the spider underwent, yet 

 it constantly retained a symmetrical figure, and through all its 

 changes was greatly inferior in size to the corresponding leg on 

 the opposite side. 



10. On the 3rd of June 1847 the left posterior leg of an im- 

 mature female Tegenaria civilis was detached at the coxa, and the 

 right posterior leg was amputated near the middle of the tibia. 

 This spider moulted on the 9th of the ensuing July, at which 

 time the left posterior leg, of small dimensions, but symmetrical 

 in form, was reproduced ; the right posterior leg was also repro- 

 duced, but the tibia, metatarsus and tarsus, compared with the 

 other joints of the same limb, were greatly disproportionate in 

 size. 



11. An immature male Agelena labyrinthica had the left pos- 

 terior leg amputated near the anterior extremity of the metatar- 

 sus on the 4th of June 1847. It cast its integument on the 

 30th of the same month, when the left posterior leg was repro- 

 duced. The coxa, femur and tibia were of the same size as the 

 corresponding parts of the right posterior leg, but the metatarsus 

 and tarsus were small, the latter remarkably so. 



12. The left posterior leg of a young female Agelena labyrin- 

 thica was detached at the coxa, and the right posterior leg was 

 amputated near the middle of the metatarsus on the 5th of June 



