ANIMALS: 



Brachioles 



Brachioles 



Stalk 



Fig. 16.1. Extinct stalked echinoderms. A, reronstrurtion of a rvstoid, Pleurocy stiles, of 

 Ordovician ae;e. B, Blasloidocnnus, an Ordovician blastoid, reconstructed from fossil remains. 

 C, fossil crinoids in a slab of Devonian limestone. For orientation in geological periods, see 

 Figure 20.1. {A, redrawn after F. A. Bather, 1900, in Lankester's Treatise; B, redrawn from 

 R. C. Moore, C. G. Lalicker, and A. G. Fischer, Inverlebrate Fossils, copyright 1952 by McGraw- 

 Hill Book Co., Inc., printed by permission; C, photograph courtesy Ward's Natural Science 

 Establishment, Inc.) 



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