175 
Physiology of the Araneidea. 
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 labyrintliica 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 lahyrin- 
thica was detached at the coxa, and the right posterior leg was 
amputated near the middle of the metatarsus on the 5th of June 
