On the Systematic Arrangement of British Spiders. 37 



Fiff. 2. Tongue seen from above : a, anterior portion ; b, posterior portion ; 

 c, membrane dividing the two portions. 



Fiff. 3. A gland removed from the papilla, much enlarged : a, terminal 

 bifid portion ; b, lower portion or duct, ciutailed. 



Fig. 4. A portion of the network of tubes in connexion with the hepatic 

 apparatus : a, anus ; b, intestine ; c, gland-hke body siurounding 

 the termination of the same ; d, network of tubes. 



Fiff. 5. Nervous system : a, a, cerebroid ganglions ; b, b, branchial ditto ; 

 c, c, pedlal ditto ; d, d, olfsictor}- ditto ; e, e, buccal ditto ; f, f, 

 gastro-oesophageal ilitto ; ff, commissure between the supra- and 

 infra-oesophageal ganglions; h, great oesophageal collar; i, mid- 

 dle cbtto ; No. 1, olfactory nerve ; 2, 3 and 4, nerves supplying 

 channel of the mouth ; 5, optic nerve ; 6, auditor^- ditto ; 7, nerve 

 to side of body ; 8 and 9, nerves to foot ; 10, nerve to generative 

 organs ; 11, ditto to skin of the back and branchial papillae ; 12, 

 ditto to buccal mass ; 13, ditto to tongue ; 14 and 15, nerves to 

 oesophagus ; 16, nerve to oesophagus and stomach. 



Fiff. 6. Generative organs : a, sac or sheath of penis ; b, testis ; c, oviduct 

 as it leaves the ovary ; d, tlilated portion of the oviduct ; e, the 

 point where the testis is united to the oviduct ; /, second dilated 

 portion of oviduct; g, semi-pellucid portion of mucus-gland in 

 connexion with the female channel ; h, opake portion of the same ; 

 i, female channel leacUng to external orifice ; j, spennatheca ; k, 

 vagina, or copiUatory channel leading from external orifice to 

 spermatheca ; I, visceral ganglion in connexiou with nerve No. 10. 



Fiff. 7- A portion of the generative organs spread out, exhibiting the con- 

 nexion of the various parts : a, penis ; b, testis ; c, dilated portion 

 of oviduct ; d, point w here the oviduct is connected with the 

 testis ; e, second dilated portion of oviduct ; /, female channel 

 leading to external opening; ff, spermatheca; h, duct of the 

 same ; i, vagiila leading to external orifice ; j, branch from the 

 vagina leading into mucus-gland. 



IV. — A Catalogue of British Spiders, including remarks on their 

 Structure, Functions, (Economy and Systematic Arrangement. 

 By John Blackwall, F.L.S. 



[Continued from vol. vii. p. 452.] 



44. Philodromus Clarkii. 



Philodromus Clarkii, Blackw. Ann. and Mag. of Nat. Hist. Second 

 Series, vol. vi. p. 338. 



A male of Philodromus Clarkii, having the palpal organs com- 

 pletely developed, was taken at Southgate in June 1849, and is 

 preserved in Mr. Walker's cabinet. 



45. Philodromus variatus. 



Philodromus variatus, Blackw. Lend, and Edinb. Phil. Mag. Third 

 Series, vol. x. p. 102. 



In summer, when the sun shines brightly, this species may be 

 seen on raUs and gates in the neighbourhood of Llanrwst. Early 



