322 



ANNULOSA. 



any animal whatever. It can be shown, in fact, that the 

 narrow serpentine markings upon the surface of the stone, 



Fig. 192. A, A small portion of the trail of Phyllndocites Jacksoni, from the Silurian slates 

 of Wurtzbach, of the natural size (after Geinitz); B, Small portion of the trail of Nereites 

 Loomisii, from the same locality, natural size (after Geinitz) ; c, Fragment of a slab, show- 

 ing Myrianites tennis, from the Silurian slates of Thornilee, Peeblesshire, of the natural size. 

 The slab has split at different levels in different parts, and the fossil is seen to cut vertically 

 across the laminae of deposition, the surfaces thus formed being concentrically striated. 

 (Original.) 



which are universally understood imder the name Myrianites, 

 are really the cut edges of thin vertical laminar expansions, 



