435 



thorax ; the occipital gibbosity is also less strong. The eyes of 

 the hind central pair are nearer to the laterals than in the male. 

 The genital aperture is rather small, of a somewhat triangular 

 form, with a kind of flap of a similar form overlapping its fore 

 part, the apex of the triangle being directed backwards. I met 

 with a female of this fine and very distinct species among dead 

 rushes in a swamp near Bloxworth, on the 12th of April, 1880. 

 Some years ago both sexes were sent to me from Northumber- 

 land by Mr. James Hardy; and from Scotland by Professor 

 Traill, of the University of Aberdeen. 



NERIENE VIVA. 



Erwone viva, Cambr., Proc. Zool. Soc. 1875, p. 330, pi. xliv., 

 fig. 5 ; and Ann. and Mag. N. H. 1879, 

 ser. 5, vol. 4, p. 210. 



Length of the adult male § rds of a line. 



Oephalo-thorax brownish yellow ; it is of ordinary form, and 

 the lateral constrictions at the caput are slight ; the profile line 

 forms a tolerably even curve, the highest point of which is at 

 the occiput. The height of the clypeus is equal to half that of the 

 facial space, and projects a little forwards at its lower margin. 

 The ocular area is furnished with a few prominent hairs, and a 

 few similar ones are disposed in a central, longitudinal lino, run- 

 ning backwards from the hind central eyes. 



The eyes are of tolerable size, nearly equal ; those of the 

 hinder row are equidistant from each other ; the intervals being 

 equal to an eye's diameter ; those of the anterior row are almost 

 contiguous to each other; the interval between either of the 

 centrals of the anterior row and the lateral on its side being 

 very small, while there is none between the centrals. The 

 interval between each fore-central eye and the hind-central 

 opposite to it is equal to the diameter of the latter. The eyes 

 of each lateral pair are, as usual, contiguous and obliquely 

 placed. 



The legs are moderate in longth and strongth, 1.4.2.3., rather 



