446 Mr. J. Blackwall 07i the Structure, Functions, (Economy, 



Castle. It contains the bones and jaws of fishes, with many 

 broken shells. It attains a thickness of about 30 feet. The 

 fossils are nearly all in a fragmentary state. This green clay 

 forms the lowest bed of Barton Cliff. 



Exeter Place, Cheltenham, Mai-ch 1851. 



XLIII. — A Catalogue of British Spiders, including remarks on 

 their Structure, Functions, (Economy and Systematic Arrange- 

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



[Contimied from p. 402.] 



26. Salticus distinctus. 



Salticus distinctus, Blackw. Linn. Trans, vol. xviii. p. 616. 

 Euophrys tigrina, Koch, Die Arachn. B. xiv. p. 6. tab. 469. 

 fig. 1275-1277. 



Salticus distinctus, like many other species belonging to the 

 same genus, has the palpi abundantly supplied with hairs, and 

 employs them as brushes to cleanse the corneous coat of the 

 anterior eyes. It occurs in Denbighshire, Caernarvonshire, and 

 the north of Lancashire on stone walls, in the interstices of which 

 the female fabricates a cell of compact white silk attached to the 

 surface of the stone. In July she constracts in this cell a 

 lenticular cocoon measuring ^th of an inch in diameter, and de- 

 posits in it about 16 spherical eggs of a pale yellow colour, not 

 agglutinated together. The young, even before they quit the 

 cocoon, exhibit some of the marks most characteristic of the 

 species. 



This spider is regarded by M. Walckenaer as identical with 

 Attus oraticus (Hist. Nat. des Insect. Apt. t. iv. p. 409), from 

 which it differs both in structure and colour. The maxillae of 

 Salticus distinctus are shorter, stronger, much more enlarged at 

 the extremity, and straighter than those of Attus erraticus ; its 

 lip too, instead of being oval and obtuse like that of the latter, 

 is triangular and pointed, and its falces, sternum, and superior 

 pair of spinners have a much darker hue ; the figures also on the 

 cephalo- thorax and abdomen of both species, designed by the 

 disposition of their respective colours, are dissimilar. 



The Euophrys tigrina of M. Koch is the same as Salticus 

 distinctus; but the Salticus tigr-inus and the Salticus litoralis of 

 M. Hahn (Die Arachn. B. i. p. 63. tab. 16. fig. 47; and p. 70. 

 tab. 18. fig. 53) should be expunged from the synonyma of 

 Euophrys tigrina, among which M. Koch has placed them, as 

 they are distinct species, and have not yet been observed in 

 Gi'eat Britain. 



