PHILOUGRIA RIPARIA. 457 



excavated over the insertion of the posterior pleopoda 

 or terminal appendages ; its middle portion is produced 

 backwards, truncately triangular, and deeply emarginate 

 at the tip. Under a lens the skin is found to be marked 

 with minute semicircular incised lines, giving the appear- 

 ance of a series of scales, as seen at Fig. h'. The outer 

 antennae appear to us to consist of only nine joints, the 

 flagellum consisting of only the four terminal articula- 

 tions. 



This species appears to be widely dispersed throughout 

 England and Ireland, although rare in the southern 

 counties of the former. It has been taken near Dublin, 

 Wexford, Cork, and Kerry by Dr. Percival Wright, 

 and at Tyrone, Waterford^ Portlaw, Kilkenny, and 

 Wicklow (Prof. Kinahan). In Epping Forest and 

 Chiselhurst, Kent ; also at Plymouth ; Polperro (in the 

 gardens of the inn, not uncommon) ; Looe abundantly, 

 among sticks by the river side. It is found in very 

 moist places amongst all kinds of decaying matter, also 

 amongst moist dead leaves, amongst wet ashes, and in 

 moss, at the roots of trees. It runs with agility, buries 

 itself deep in the ground, and generally congregates in 

 numbers. It is very impatient of dryness, soon dying 

 on exposure to air (Kinahan). It feigns death when 

 disturbed, but does not attempt to roll itself in the least. 

 Professor Kinahan found it with ova and young from 

 February to November. 



