318 LINYPHIIDiE. 
above, projecting over the base of the cephalo-thorax; it is thinly clothed with hairs, glossy, 
and black. 
Adult males of this interesting species were taken on iron-rails at Crumpsall Hall, in 
the autumn of 1832, and it has since been met with, at different seasons of the year, in 
various parts of Lancashire, Yorkshire, Cheshire, Dorsetshire, Denbighshire and Caernarvon¬ 
shire. Little is known as regards its economy, except that it is active during the day, 
decidedly aeronautic, making frequent ascents into the atmosphere, and that it can exist for a 
long period of time immersed in water. 
This spider, on which the genus Savignia was founded, was supposed, when discovered, 
to have only six eyes. Since then it has been found to possess an additional pair of visual 
organs, difficult to be discerned, situated towards the front of the apex of its conical cephalic 
prominence; consequently it had to be removed from the tribe Senoculina, in which a place 
had been assigned to it, to the genus Walclcenaera, with the spiders of which genus it is 
connected by marked relations of affinity. 
Genus — Pachygnatha, Sund. 
Eyes arranged on the anterior part of the cephalo-thorax, in two transverse rows; the 
four intermediate ones form a square, those of each lateral pair being placed obliquely on a 
small tubercle, and nearly contiguous. 
Maxillae long, inclined towards the lip, slightly dilated at the extremities, which converge 
abruptly and are in contact. 
Lip large, triangular, pointed or rounded at the apex. 
Legs long and slender ; the first pair is the longest, then the second, and the third pair is 
the shortest. 
Falces very powerful, diverging widely at their extremities. 
Pachygnatha Clerckii. PI. XXII, fig. 233. 
Pachygnatha Clerckii, Sund., Yet. Acad. Handl,, 1829, p. 208, and 1832, p. 258. 
— -— Blackw., Annals and Mag. of Nat. Hist., second series, vol. ix, 
p. 466. 
— Listen, Koch, Uebers. des Arachn. Syst., erstes Heft., p. 10. 
— —- Koch, Die Arachn., Band xii, p. 142, tab. 430, fig. 1064. 
Manduculus ambiguus, Blackw., Lond. and Edinb. Phil. Mag., third series, vol. iii, 
p. 111. 
— —- Blackw., Research, in Zool., p. 359, pi. 3, figs. 3—5. 
Theridion maxillosum, Hahn, Die Arachn., Band ii, p. 37, tab. 53, fig. 122. 
Linyphia maxillosa, Walck., Hist. Nat. des Insect. Apt., tom. ii, p. 267. 
— Clerckii, Walck., Ibid., tom. ii, p. 270. 
