450 REV. O. P. CAMBRIDGE ON NEW BRITISH SPIDERS. 
which so close an observer as he was would hardly have overlooked. I am therefore 
inclined to think it distinct, though closely allied. 
NERIENE APERTA, n. Sp. 
Female adult, length + of an inch. | 
The cephalothorax, legs, falces, maxillæ, labium, and sternum of this species are of a 
yellow-brown colour, slightly tinged with red, the sternum being rather the darkest. 
The abdomen is of a dull black, tinged with yellowish, and furnished sparingly with 
hairs; there are some obscure pale lines and markings on the upperside; and two longi- 
tudinal parallel lines on the inner side are visible in spirit of wine. The eyes do not 
differ much in size; those of the hinder row (which is more curved than the front row) 
are equidistant from each other; the fore centrals are contiguous to each other, and each 
is separated from the fore lateral one on its side by no more than half its own dia- 
meter; the fore centrals are of a yellowish colour, the laterals being pearly white, and 
the hind centrals bluish gray. | 
Cephalothorax but slightly compressed laterally in front. Caput rather rounded above, 
and alittle higher behind the eyes than it is in the ocular region itself; but no depres- 
sion existed at the junction of the caput with the thorax; the clypeus is fully equal in 
height to the length of the space occupied by the fore and hind central pairs of eyes. 
The maxille and labium do not differ in structure from the usual generic types. 
The legs are rather long, and not very strong ; their relative length is 4, 1, 2, 3, and they 
are furnished with hairs above of different lengths and strength. 
The leading character which distinguishes it from every other one resembling it in 
size, general colour, and structure that I have as yet observed, is the large somewhat 
circular orifice to the sexual organs. These organs are externally rather tumid, and of a 
red-brown colour. 
The specimen above described was captured by myself among moss at Bloxworth, in 
April 1866; it belongs evidently to the “ livida ” group, but may easily be distinguished | 
by its small size and by the size and form of its sexual aperture. 
NERIENE SUNDEVALLII. | 
Erigone Sundevallii, Westr. Araneæ Suecicæ, p. 290. 
I have met with this remarkable spider among moss and herbage in woods and damp 
places at Bloxworth on various occasions in the months of April, May, and June, during 
several years past. It may be distinguished from all its congeners by a double row of 
strong eurved spines beneath the legs of the first two pairs. This is its first record as à 
British species. 
Genus WALCKENAËRA. 
WALCKENAÉRA MEADIL, n. sp. (Pl. 57. no. 36.) 
Male adult, length 11 lines. 
: Cephalothorax small, oval, narrowest and very slightly compressed laterally at the 
caput; this portion is but very slightly elevated, its upper part is round, and thence it 
runs by an even slope to near the abdomen; the ordinary grooves and indentations are E 
