Crinoidea — Stone-lilies. 



101 



form rock-masses. This fact is illustrated by a small collection Crinoid««. 

 at the end of Wall-case 18; also by a fine polished slab from the GALLEAY 

 Mountain Limestone of Derbyshire ; this is almost entirely com- _, ^J^o^. 

 posed of the broken stems of Actinocrinus, and is known as crinoid «r ,j 



Fig. 156. Fio. 167. *^*'® ^*' 



Fig. 156. — Restored figure of Lepadocrinus quadri- 

 fasciatus, Pearce, sp. (original), a Cystid from 

 the Wenlock Limestone, on the evidence of 

 specimens in the Museum. The armlets of the 

 outer rows are erect; those of the middle row, 

 depressed. Near the top of the left-hand quarter 

 is the anus ; near the top of the right-hand 

 quarter is a group of apparent slits, called a 

 "pectinated rhomh." 



Fig. 157.— Restored figure of Orophocrinus fusi- 

 formis, Wachs. and Spr. (original), a Blastoid from 

 the Carboniferous (Kinderhook) of Iowa, U.S.A., 

 on the evidence of specimen E l726^andof one 

 belonging to F. Springer, E ""' 



suggested by that of a Pentremites 

 Springer's collection. 



The root is 

 in Mr. 



marble. Another slab shows the Silurian Limestone of Gotliland, 

 similarly composed of crinoid remains. 



