FOSSIL WORMS. 



167 



marked all over, below and above, with sinuous 

 worm-tracks. These cliffs rise sheer out of the green 

 Atlantic to a height of three hundred 

 feet, and appear to be of the same 

 character throughout. Everywhere, 

 where it is possible to examine them, 

 the thin flags are crowded with these 

 peculiar markings. People who have 

 been to the celebrated quarries in 

 the same geological formation near 

 Kirkby- Lonsdale, will have observed 

 the flags impressed in a similar way. 

 I give a sketch of them as they appear 

 in a hand specimen. As these Kirkby- 

 Lonsdale flags are much in demand 

 by house-builders in the north, and 

 therefore get widely distributed, some 

 of my readers may have seen them 

 a long way from their parent quarry. 

 The commonest of these worm- 

 markings is Crossopodia, In Pen- 

 whapple Glen, Girvan, Ayrshire, many 

 species of worm-tracks have been 

 recognized, belonging to Nereites, 

 Myrianites, Crossopodia, Nemertites, 

 etc. ; annelid markings are also found 

 in the shales at Moffat. A peculiar \ / 



kind of worm-track, called Cyma- Fig. xss.-Large'tubukr 

 derma, is left on the surfaces of the Hibe^icti^"'^'^'' 



