REV. O. P. CAMBRIDGE ON NEW BRITISH SPIDERS. 447 
NERIENE INCISA, n. sp. (Pl. 57. no. 34.) 
Female adult, length + of an inch. 
The entire fore part of this spider is of an orange-yellow colour. The eyes are rather 
closely grouped on the fore part of the caput ; but in respect to generic characters there 
is no departure from the usual type. The cephalothorax is small; and a remarkable 
structural peculiarity in it distinguishes it at once from any other species known to me— 
that is, the strong notch or depression at the junction of the caput and thorax. This is 
especially observable when looked at in profile, and leaves the caput in appearance much 
elevated, which in reality is not the case, it being only on a level with the thorax un the 
commencement of the hind slope. 
The falces are small, prominent in front near their base, and slightly projecting for- 
ward; they have a few fine bristles on their inner surface forward; the legs are mode- 
rately long and strong, and are furnished rather plentifully with longish fine hairs, and 
one or two slender erect bristles on their uppersides. Palpi furnished with rather 
stronger hairs, and a prominent bristle at the extremity of the upperside of the cubital 
joint. 
Abdomen large, oviform, convex above, and projecting a little over the base of the 
cephalothorax. It is glossy, and of a dull black colour, elothed sparingly with hairs; 
spinners rather prominent, and (together with the spiracular plates) of a pale luteous 
colour. Sexual organs rather tumid, and with a short semicircular corneous-edged 
epigyne projecting backward from them. 
An adult female of this species was captured by myself under a stone at Hendre 
House, Llanrwst, N. Wales, in April 1860. Hoping to meet with the male, I have 
hitherto left it undescribed. I have since received an example of it (also a female) 
from the neighbourhood of Paris, kindly sent me among many other interesting species 
by M. Eugène Simon, an enthusiastic araneologist. It bears great resemblance in size, 
colour, and general appearance to the female of N. rubripes, a species I also captured 
at the same time and in the same situations. 
NERIENE FORMIDABILIS, n. Sp. 
Male adult, length very nearly ith of an inch. 
This species, which is the largest of the genus that has yet come under my notice, is 
evidently nearly allied to N. Huthwaitii (Camb.), of whieh the female is at present 
undescribed. The position of the eyes and form of the falces, however, lead me to think 
it is not the female of that species. The present species has the cephalothorax of a dark 
yellow-brown colour; it is of a long oval form, a little compressed laterally forward, 
where, however, it is still broad and massive; the profile shows no depression at the 
junetion of the caput and thorax, but follows a rather convex curved line from the eyes 
to the hind slope, which is long and gradual, with a broad shallow indentation; the 
other normal grooves and furrows are well defined ; the height of the clypeus (whieh is 
perpendieular) equals the length of the space occupied by the fore and hind central pairs 
of eyes. The space between these eyes is equal to that between each hind central eye 
and the external one of the front row on its side, and also equal to that between eaeh 
