NERIENE. 
257 
The cephalo-thorax is oval, convex, glossy, with an indentation in the medial line; the 
falces are powerful, conical, armed with teeth on the inner surface, and inclined towards the 
sternum, which is heart-shaped; the maxillae are strong, and inclined towards the lip, which 
is semicircular and prominent at the apex. These parts are of a brownish-black colour. 
The legs are slender, provided with hairs and a few fine, erect spines, and have a pale, reddish- 
brown tint; the anterior and posterior pairs are equal in length ; each tarsus is terminated by 
three claws; the two superior ones are curved and pectinated, and the inferior one is inflected 
near its base. The palpi have a dark-greenish hue. The abdomen is slender, oviform, and 
projects a little over the base of the cephalo-thorax; it is thinly clothed with hairs, and of a 
brownish-black colour ; and the branchial opercula have a dark-brown tint. 
The male closely resembles the female in colour, but its falces and maxillm are tinged 
with red, and the former, which are divergent at the extremity, have a small process in front, 
near the articulation of the fang. The humeral joint of the palpi is curved towards the 
cephalo-thorax, and has a row of hairs, directed forwards, extending along its upper part; 
the cubital and radial joints are short; the latter, which is much the stronger, is slightly 
elongated in front, and has a small, pointed process on the outer side, near its extremity ; 
the digital joint is somewhat oval, having at the upper part a bold prominence, indented on 
the outer side, and a curved, conical protuberance on the inner side; it is convex and hairy 
externally, concave within, comprising the palpal organs, which are highly developed, com¬ 
plicated in structure, prominent, and of a dark, reddish-brown colour. 
Both sexes of this species were taken on rails at Crumpsall Hall, near Manchester, and 
at Capel Garmon, in the parish of Llanrwst, Denbighshire, in the autumn of 1836. 
Neriene VAGANS. PI. XVIII, fig. 1 73.' 
Neriene vagans, Blackw., Research, in Zool., p. 374. 
— — Blackw., Annals anrl Mag. of Nat. Hist., second series, vol. ix, p. 21. 
Length of the female, T yh of an inch; length of the cephalo-thorax, Ath, breadth, 5 ' 0 th ; 
breadth of the abdomen, ^th; length of an anterior leg, ±th; length of a leg of the third 
pair, ^th. 
The anterior eyes of the four intermediate ones forming the trapezoid are very minute 
and near to each other. The cephalo-thorax is oval, convex, glossy, somewhat depressed 
before, where the eyes are situated, and has a slight indentation in the medial line ; the falces 
are strong, conical, armed with teeth on the inner surface, and inclined a little towards the 
sternum, which is convex and heart-shaped; the maxillae are enlarged at the base, where the 
palpi are inserted, slightly so at the extremity, and inclined towards the lip, which is semi¬ 
circular and prominent at the apex. These parts are of a dark-brown colour, the lip being 
the darkest. The legs have a red-brown tint, and the anterior and posterior pairs are equal 
in length; each tarsus is terminated by three claws; the two superior ones are curved and 
pectinated, and the inferior one is inflected near its base. The palpi resemble the legs 
