Mr. J. Black wall on British Spiders. 497 



and might compare it with the formulas of other species. But, 

 after all, we have here a mere mathematical abstraction, a sym- 

 bol for an amount or law of force, which can be turned into con- 

 ceptions, only by imagining (supposing this possible) the force 

 in the course of its evolution of concrete realities, according to the 

 law of development and laws of variations embraced within it. 



XLVII. — Supplement to a Catalogue of British Spiders, including 

 remarks on their Structure , Functions, (Economy, and Systematic 

 Arrangement. By John Blackwall, F.L.S. 



[Continued from vol. xiv. p. 33.] 



Tribe OCTONOCULINA. 



Family Mygalid^. 



Genus Atypus, Latr. 



Atypus Sulzeri, 



To the remarks on this species given in the catalogue (Ann. and 

 Mag. Nat. Hist. 2nd Series, vol. vii. p. 257) add the following 

 particulars. Since the instances of the capture of Atypus Sulzeri, 

 recorded by Dr. Leach, several females have been procured by 

 the Rev. Hamlet Clark from the neighbourhood of Carlisle ; 

 Mr. B. H. Meade also has received specimens of it from Mr. 

 Newman, which were found in lanes near Hastings in the 

 autumn of 1855 ; and Mr. 0. P. Cambridge took an adult male 

 early in January 1857, from a rabbit-earth in Dorsetshire, which 

 Mr. Meade afforded me an opportunity of inspecting. 



Family LycosiDiE. 



Genus Lycosa, Latr. 



After Lycosa rapax in the catalogue (Ann. and Mag. Nat. 

 Hist. 2nd Series, vol. vii. p. 258) add 



Lycosa herbigrada, 



Lycosa herbigraday Blackw. Ann. and Mag. Nat. Hist. 2nd Series, 

 vol. XX. p. 285. 



Two adult and two immature females of this Lycosa were 

 forwarded to me in Wales, in December 1856, by Mr. R. H. 

 Meade. The two former were discovered by Mr. 0. P. Cam- 

 bridge under a stone, near Pennsylvania Castle, in the Isle of 



