252 Mr. J. Blackwall on the Structure, Functions, (Economy, 



It spins a long tube, which serves for a domicile, in the crevices 

 of rocks and walls, and under lichens growing on trees. Towards 

 the end of May or the beginning of June the female deposits 

 between 80 and 90 spherical eggs of a yellowish white colour, 

 not agglutinated together, in a lenticular cocoon of white silk of 

 a fine but compact texture, measuring ^th of an inch in diameter, 

 which is inclosed in a silken cell, attached to objects near her 

 retreat, and covered with particles of earth and the refuse of her 



This species, when m captivity, does not complete its several 

 changes of integument and arrive at maturity in less than two 

 years, and I have ascertained that its existence sometimes extends 

 through a period of four years. Only three spinning tubes are 

 connected with each intermediate spinner of this spider ; they 

 are situated at its extremity and are of large dimensions. 



Genus Schcenobates, Blackw. 

 207. Schcenobates Walkeri. 



Schcenobates Walkeri, Blackw. Ann. and Mag. of Nat. Hist. Second 

 Series, vol. vi. p. 343. 



An adult male of this very interesting spider was captured at 

 Broadstairs in Kent in the month of September, and is in Mr. 

 Walker's cabinet. It is preserved in Canada balsam, and has 

 suffered from compression, circumstances which render an inves- 

 tigation of its structure difficult. After a most careful inspection 

 under the microscope, I could not ascertain that it had more than 

 six eyes ; but even should it ultimately be found to possess eight 

 of those organs, it must still, by its other essential characters, 

 constitute a new genus. 



Genus Oonops, Templeton, 

 208. Oonops pulcher. 



Oonops pulcher, Templeton, Zoological Journal, vol. v. p. 404. pi. 17. 



fig. 10; Blackw. Linn. Trans, vol. xix. p. 129. 

 Deletrix exilis, Blackw. Lond. and Edinb. Phil. Mag. Third Series, 



vol. x. p. 100. 

 Dysdera pulchra, Walck. Hist. Nat. des Insect. Apt. t. iv. p. 382. 



In the * London and Edinburgh Philosophical Magazine,' I 

 proposed the genus Deletrix for the reception of this minute 

 spider, which I described, under the specific name of exilis, from 

 immature females whose colours had been injured by captivity. 

 At that time I was not aware that I had been anticipated by 

 Mr. Templeton, whose genus Oonops, founded on the organic 

 peculiarities of this species, has the claim of priority. 



