CARBONIFEROUS. 113 



ften are at the present day. One of these 

 she! thin variety of the common hedge 



she'. iin, named Helix. The second 



appears to be identical with the existing genus 



•\/, which is commonly found about the roots 



<■ the oldest terrestrial shells 



known. 



\ — I with the land shells are centipedes. 



iapods to which they belong is 

 tished by having one pair ^( antennae, eyes 



no distinct thorax, and no 

 wings; while limbs are attached to nearly all the 



have three pairs of 



l le res] 5 in insects, is carried on 



, which open near the articulations of 



the *t in the living genus Peripatus. 



Myriapods live in the hark of trees, in 



Its in the rock, and under stones. The oldest 



\\\y\ in the hollow trunks of Sigil- 

 laria. They are Millipedes rather than centi- 

 pedes. They are known in the carboniferous 

 roek^ of Canada. A Millipede found in the coal 



-hire, named Euphoberia y IS four inches 

 long, nearly a quarter of an inch broad, formed 



of thirty-six body rings, each with two pairs of 

 rfiese myriapods are distinguished by pos- 



5ing branched spines which are hollow. The 



American gen us Xylobius ha- been found at Glas- 

 gow and Eiuddersfield, in the eoal. 



The spiders of the coal belong to a group 

 known as the false scorpions, of which the type 

 is the living genus Phrynus. Eophrynus Prestwichi 



is a well-known, though rare fossil from the iron- 

 stone of Dudley. It resembles spiders in having 

 four pairs of legs, and a pair of palpi is seen. On 

 the under side of the body are the openings of 

 8 



