63 



Petrobius maritimus. Leach Edin. EncijcL 9- 77. 



Encycl. Brit. Supp. 1. pi. 24. 



Habitat in Britannia inter scopulos ad littora maris. 



This species, which was first described by myself in the 

 works quoted above, is found in the greatest plenty on all 

 the rocky coasts of Great Britain and Ireland. It is very 

 active, runs fast, and leaps to a great distance. 



I am inclined to suspect that it has been confounded by 

 Fabricius M'ith Forbicina pohjpoda, (^Lepisma polypoda 

 Linn^.) 



