TABLE OF CONTENTS. 



Page. 



Preface 9 



Terminology as applied to the skeleton of Paleozoic Asteroidea 13 



Finding list of Paleozoic Stelleroidea 18 



Remarks on the development of Paleozoic Stelleroidea 27 



Geological 27 



Distribution 27 



Preservation and occurrence 28 



Asterid evolution 30 



General observations 30 



The most primitive fossil starfish 31 



Origin of the wriggling type of starfish 32 



The asterid radicle 34 



Ontogeny 36 



Regeneration 37 



Number and character of rays 38 



Development of the parts 39 



Anus 39 



Madreporite 39 



Spinosity 41 



Ambulacralia 41 



Adambulacralia 43 



Inframarginalia 43 



Supramarginalia 45 



Radialia 46 



Accessory plates 47 



Ocular plates -^, 48 



Centro-dorsal 48 



Primary disk-plates 49 



Axillary ossicles 49 



Interbrachial areas 50 



Classification 51 



Catalogue of Paleozoic Stelleroidea 51 



Description of genera and species 51 



Class Stelleroidea 51 



Subclass Asteroidea 51 



Phanerozonia 51 



Family Hudsonasteridae 53 



Hudsonaster 53 



Siluraster 65 



Family Palseasteridse 66 



Palseaster , 67 



Australaster 72 



5 



