386 Rev. O. P. Cambridge on three new 



tions imperceptible. Legs nearly equal in length ; thorax 

 and abdomen surmounted by a large, somewhat irregular elon- 

 gated hump or eminence, sloping upwards from the fore to the 

 hinder part. 



Habit of life and habitat unknown. 



Gen. nov. Westwoodia. 



Characters of Genus. 



Cephalothorax and abdomen with no apparent divisional 

 marks, but elevated gradually to a considerable height at the 

 posterior extremity of the latter. 



Eyes two, one on either side, just above the basal joints of 

 first pair of legs. 



Mouth-parts very minute, closely compacted, and almost 

 entirely concealed within an oval corneous cavity beneath the 

 caput, just in front of the first pair of legs. Genital aperture 

 of considerable size, close behind the basal joints of the fourth 

 pair of legs. Anal orifice (?) of still larger dimensions, a little 

 way behind the genital parts, at the lower extremity of the 

 hinder part of the abdomen. 



Legs 6-jointed, articulated beneath the cephalothorax, but 

 with no distinct sternum ; relative length 1, 4, 2, 3, but not 

 greatly differing in actual length ; tarsi rather long, undivided, 

 and terminating with three claws of equal size, and, apparently, 

 side by side, i. e. not divided into a superior pair and a single 

 inferior claw. 



Westwoodia obtecta, sp. n. PL XIII. fig. 2. 



Adult female, length rather less than 1 line. 



Looked at from above, this curious Arachnid is of an elon- 

 gated oval shape, but in profile it is of a triangular form, and 

 nearly black colour mixed with dark red-brown ; the fore ex- 

 tremity of the caput projects forwards, and is of a flattened 

 oblong form ; the upperside of the abdomen, which is not 

 distinguishable from the cephalothorax, is much elevated, 

 rising gradually from the thoracic region to its highest part at 

 the hinder extremity ; the surface is uneven and rough, and 

 the upperside of the abdomen has a laterally crushed appear- 

 ance, which, however, may be from accidental pressure ; it 

 was so covered with debris of an earthy nature, that its tex- 

 ture and clothing were not distinguishable, except a few curved, 

 pale, bristly hairs on the highest (posterior) part of the abdo- 

 men : the underside shows a subtriangular space, on either 

 side of which the legs are articulated ; behind the legs are two 

 large, oval, rather convex, corneous, red-brown prominences ; 



