PORCELLIO DILATATUS. 479 



joints of nearly equal length. The lateral lobes of the 

 front of the head are large, and curved rather outwards ; 

 they extend rather beyond the anterior angles of the 



/ - 



first segment of the body, which, together with the two 

 or three following segments, are marked with rather 

 oblique and slender lines and rugosities. The terminal 

 segment of the tail has the sides of the apical half 

 nearly parallel, and the tip itself rounded. 



It is of an uniform slaty-grey colour, with faint 

 irregular pale lines and spots indicating the chief 

 rugosities. 



It is found amongst decaying grass and straw, and 

 appears to be extremely rare. It crawls very slowly, 

 and partially rolls itself into a ball. It is very brittle 

 in its texture, a touch causing the limbs to fall off. 



Specimens are preserved in the British Museum, found 

 by Prof. Kinahan, from the neighbourhood of Dublin. 



