472 ONISOID/E. 



opaque upper surface of the body, which is finely punc- 

 tured and furnished with the same kind of oblong- 

 tubercles found in 0. asellus, but more numerous and 

 closely arranged. The head also is more prominent. 

 It is of a more uniform brownish-grey colour, although 

 exhibiting the same kind of pale patches and rows of 

 spots seen in that species. It also appears to be uni- 

 formly smaller than O. asellus. 



We have adopted the reference to Koch's figure of 

 Oniscus fossor, which Professor Kinahan states to be very 

 characteristic, although the flag ell um of the antennae is 

 only represented with two instead of three joints, as in 

 the type of the genus. 



This species inhabits dry places under stones and dry 

 leaves. It is more active than the preceding species. It 

 has been taken in Epping Forest and Chiselhurst, Kent, 

 and near Dublin and Wexford, in Ireland. Specimens 

 are in the British Museum, as well as in the Stephensian 

 Collection of Crustacea at Oxford, purchased by the 

 Rev. F. W. Hope, the latter being named O. asellus ; 

 and the Rev. A. M. Norman records it from Sedgefield, 

 Co. Durham. 



