NERIENE. 
267 
The legs have a red-brown hue; the anterior and posterior pairs are equal in length, and 
the tibiae of the former are disproportionally strong, having the appearance of being swollen ; 
each tarsus is terminated by three claws; the two superior ones are curved and slightly pecti¬ 
nated, and the inferior one is inflected near its base. The cephalo-thorax is oval, convex, 
glossy, prominent but obtuse before, where the eyes are situated, and has an indentation in 
the medial line; the falces are conical, armed with teeth on the inner surface, and somewhat 
inclined towards the sternum, which is heart-shaped. These parts, with the maxillse and lip, 
have a brownish-black tint. The palpi are slender, and resemble the legs in colour; the cubital 
joint is long and clavate; the radial joint is elongated before into a narrow, oval, hairy pro¬ 
cess, which extends obliquely across the upper part of the digital joint towards the inner side, 
and is terminated by a short, acute spine, curved outwards; the digital joint is oval, convex 
and hairy externally, concave within, comprising the palpal organs; these organs are highly 
developed and complicated in structure, presenting several processes, one of which, situated 
at the extremity, on the outer side, is curved in a circular form. The abdomen is oviform, 
convex above, projecting over the base of the cephalo-thorax; it is thinly clothed with hairs, 
glossy, and of a brownish-black colour; that of the branchial opercula being pale-yellow. 
A few adult males of Neriene tibialis were taken in March, 1835, under stones at Oakland. 
Neriene cornuta. PI. XYIII, fig. 181 . 
Neriene cornuta , Blackw., Lond. and Edin. Phil. Mag., third series, vol. iii, p. 190. 
— Blackw., Research, in Zool., p. 372. 
— ■— Blackw., Annals and Mag. of Nat. Hist., second series, vol. ix, 
p. 268 . 
Length of the female, ^th of an inch; length of the cephalo-thorax, ^tli, breadth, 5 ’ s th; 
breadth of the abdomen, s ' 5 th; length of an anterior leg, jth; length of a leg of the third 
pair, ^th. 
The cephalo-thorax is glossy, convex where the eyes are situated, compressed before, and 
rounded on the sides, which are marked with furrows converging towards a large indentation 
in the medial line; the falces are strong, conical, vertical, and armed with teeth on the inner 
surface; the maxillae are inclined towards the lip, which is semicircular and prominent at the 
apex; the sternum is convex and heart-shaped. These parts are of a very dark-brown colour, 
the anterior region of the cephalo-thorax being almost black. The legs have a light, 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 slightly pectinated, and the inferior one 
is inflected near its base. The palpi resemble the legs in colour. The abdomen is oviform, 
rather convex above, projecting over the base of the cephalo-thorax ; it is sparingly clothed 
with short hairs, glossy, and of a black hue, that of the branchial opercula being pale-yellow. 
The male does not differ from the female in colour, but the anterior part of its cephalo- 
thorax is surmounted by two conical protuberances, directed forwards, before which the eyes 
