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 dry ness, soon dying 



011 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. 



