HERMANNIA RETIOULATA. 461 



Abdomen oblong, generally sharply constricted a 

 short distance from the posterior margin, the postero- 

 lateral angles of the portion behind the constriction 

 are formed by two large raised lobes, which cause the 

 corners of the abdomen to project, and each bears a 

 spatulate hair on the top of the lobe ; these two lobes 

 are usually, but not invariably, joined by an elevated 

 roll concave posteriorly. Between these two lobes the 

 hind margin of the actual dorsal surface is nearly 

 straight, but is broken by two lobes lower in level and 

 also bearing spatulate hairs ; often there is not any 

 sharp distinction between these and the dorsal surface. 

 The progaster is straight or slightly concave ; the noto- 

 gaster is a flat surface with raised lobes and rolls upon 

 it ; these are, firstly, a large raised roll forming the 

 lateral edges, and often united by a similar roll form- 

 ing the progaster, so that the whole of the lateral and 

 anterior margin is formed by one continuous roll ; the 

 lateral part of this roll is usually, but not invariably, 

 cut into a series of lumps or lobes, as in fig. 2, and 

 there are three pairs of lumps or lobes, forming two 

 longitudinal rows nearer the median line ; the two 

 lobes of a pair often almost touch, sometimes they 

 coalesce, and sometimes they may coalesce with those 

 behind them ; this produces considerable variety in the 

 appearance of different specimens, or possibly of the 

 same specimen at different ages. There are two longi- 

 tudinal lines of spatulate hairs on the notogaster, and 

 a line of similar hairs near each lateral margin ; when 

 the lobes, or lumps, are distinct there is usually one of 

 these hairs on each lobe. 



Distribution. — I have found the species at the Land's 

 End, Cornwall, and in Staffordshire, and have received 

 it from Wales and the Isle of Man ; it seems rather 

 more frequent in places within a moderate distance of 

 the sea ; I find it in lichen and moss. I am not aware 

 of its having been taken abroad, except Thorell's 

 specimen above referred to. 



