and (Economy of the Araiieidea. 233 



8. A j'oung male Tegenaria civilis had tlie right palpus amputated 

 at the axillary joint on the LGth of January 1S40. It nioultod on the 

 2nd of tiic followitig June, \slifn the ik'taelicd part, of a small size, 

 was reproduced and tlie digital joint became very tumid. On the 

 12th of August, in the same year, it moulted again ; the right paljjus 

 was augmented in size, the radial joint was furnished with an apo- 

 physis, and the sexual organs, complete in their organization, were 

 developed ; these several parts, however, were still decidedly smaller 

 than the corresponding parts of the left ])alpus. 



9. On the 2.3th of January 184-0 the left palpus of a young female 

 Tegenaria cii'ilis was amputated at the axillary joint. This spider 

 moulted on the 1st of the ensuing May, at which time the detached 

 part, of a small size, was reproduced. On the 20th of June and the 

 6th of August, in the same year, it moulted again and arrived at 

 maturity, the left palpus receiving an increase in size at each suc- 

 cessive moult. 



10. A young male Ciniflo ferox had the cubital, radial and di- 

 gital joints of the left palpus amputated on the 2Gth of May 184-0. 

 It moulted on the 18th of the following June and reproduced the 

 left palpus, which was small, with the digital joint very tumid. On 

 the 8th of August, in the same year, it moulted again, when the left 

 palpus was enlarged, the apophyses of the radial joint were produced, 

 and the sexual organs were developed. Though the several parts of 

 the left palpus were smaller than the corresponding parts of the right 

 palpus, yet they were perfect in their organization. 



1 i. The left palpus of a young male Cinijio atrox was amputated 

 at the axillary joint on the 28th of May 1840. This spider changed 

 its integument on the 27th of the following June, and reproduced 

 the left palpus, which had the digital joint very tumid. On the 11th 

 of August, in the same year, it moulted again, when the apophyses 

 of the radial joint and the sexual organs, perfect in structure, were 

 developed, but all the parts of the left palpus were smaller than the 

 corresponding parts of the right palpus. 



12. A young male Linyphia cauta had the right palpus at the 

 axillary joint, the cubital, radial and digital joints of the left palpus, 

 and the tibiae and tarsi of the first, second and third legs on the left 

 side amputated on the 30th of May 1840. On the 25th of the en- 

 suing June it moulted, when the stumps only of the palpi were pro- 

 duced, but the mutilated legs, of small dimensions, were reproduced. 

 It moulted again on the 21st of July, in the same year, and though 

 the palpi still were not reproduced, yet the newly-formed legs were 

 augmented in size and the spider arrived at maturity. 



13. The digital joint of the left palpus of a young male Linyphia 

 cauta, which was very tumid, was amputated on the 20th of July 

 1840. The spider moulted on the 19th of the following August, 

 reproduced the left palpus, of a small size, with the digital joint 

 considerably modified, and at the same time arrived at maturity ; 

 but the sexual organs were not reproduced. 



14. A young male Tegenaria civilis had the right palpus ampu- 

 tated at the axillary joint on the 9th of June 1841. On the 13th of 



Ann. i^- Mag. X. Hist. V^ol. xv. S 



