174 Mr, J. Blackwall on certain Plimiomena in the 



produced. On the 8th of August it moulted again and the entire 

 limb was restored. The same leg was detached at the coxa on 

 the 14th of August, the 26th of September, and the 12th of 

 November ; and was reproduced on the 19th of September, the 

 8th of November, and the 20th of May 1846, respectively, at 

 which periods the spider changed its integument. At the last 

 date, the right palpus, which had been detached at the axillary 

 joint on the 12th of November 1845, was also reproduced ; both 

 it and the right anterior leg were small but symmetrical, the 

 latter having been reproduced four times. 



4. A very young male l^eyenaria civilis had the left posterior 

 leg detached at the coxa on the 5th of August, the 14th of Sep- 

 tember, and the 29th of October 1845, and on the 18th of April 

 and the 8th of June 1846. This spider cast its integument on 

 the 10th of September and the 25th of October 1845, and on 

 the 10th of April, the 5th of June and the 4th of July 1846, re- 

 spectively, at each of which dates, except the last, the left poste- 

 rior leg was repi'oduced, but on the 4th of July the coxa only was 

 produced. The circumstances attending the restoration of this 

 limb were similar to those recorded in experiments 2 and 3. I 

 may add, that the spider frequently moistened the tarsus of the 

 third leg on the left side with saliva and applied it to the injured 

 part. 



5. Half of the metatarsus, with the tarsus, of the right an- 

 terior leg of an immature male Ep'eira antriada was amputated 

 on the 20th of August 1845. On the 8th of the ensuing Sep- 

 tember the spider moulted and the right anterior leg was re- 

 produced. The coxa, femur and tibia of the new limb were of 

 the same dimensions as those parts of the corresponding leg 

 on the opposite side, but the metatarsus and tarsus were very 

 small. 



6. An immature female Ciniflo ferox had about a third of the 

 tibia, the metatarsus and tarsus of the left anterior leg amputated 

 on the 14th of March 1846. It moulted on the 14th of the 

 following May, when the coxa, femur and genual joint of the 

 left anterior leg, which was reproduced, were of the same size as 

 the corresponding parts of the right anterior leg, but the tibia, 

 metatarsus and tarsus were very diminutive. This spider moulted 

 again on the 23rd of July in the same year ; at the same time 

 the tibia, metatarsus and tarsus of the new limb were consider- 

 ably enlarged. 



7. A young female Tegenaria civilis, which had the right pos- 

 terior leg amputated near the anterior extremity of the tibia on 

 the 16th of March 1846, cast its integument on the 24th of the 

 ensuing May and the mutilated limb was reproduced ; the coxa, 

 femur and genual joint were of the same dimensions as the cor- 



J 



