LIST OF ILLUSTRATIONS. XI 



Page. 



Diagram showing the course of the canal in Endoxocrin us parrai 90 



Diagram illustrating the difference in the arrangement of the axial canals be- 

 tween Isocrinus decorus and Metacrinus rotundus and Endoxocrinus parrse; 

 the diagram, with the omission of the dotted line, represents the condition in 

 Isocrinus decorus and Metacrinus rotundus; in Endoxocrinus parrx the infra- 

 basals are entirely resorbed and the basals are resorbed as far as the dotted 



line, with a corresponding increase of the small central area 91 



Articular face of a "straight muscular" articulation 115 



Articular face of an ' ' oblique muscular " articulat ion 115 



Vn axillary with "straight muscular" distal faces 115 



dorsal view of an axillary united to the preceding joinl by "synarthry," and 



to the two succeeding by "straight muscular" articulations 1 l(i 



Articular face of a "synarthry " 116 



Vn axillary with "oblique muscular" distal faces IK; 



Lrticular face of a " syzygy " L16 



)orsal view of an axillary, all three of whose faces are "oblique muscular; " the 



articulation between the two post-axillary joints is also "oblique muscular " . . 117 



^entametrocrinidic; Pentametrocrinus 117 



'roximal part of arm of Pentametrocrinus tuberculatum, showing the external 



appearance of the articulations 117 



'roximal part of arms of Thaumatometra tenuis, showing the external appearance 



of the articulations 117 



^entametrocrinidx; Thaumatocrinus 118 



^entametrocrinidse; Decametrocrinus 118 



'ygometridx; Eudiocrinus 118 



'ygometridse; Zygometra Ms 



'ygometridse; Catoptomctra 119 



intedonidx; Ileliomctra 119 



1 telecrinidse; Atelecrinus 119 



Vhalassometridse; Charitometra L20 



Iimerometridse ; Ilimerometra; also, Comasteridse ; Phanogenia 1 20 



lomasteridse; Comatula 1 20 



Comasteridse; Comatula 121 



Jomasteridse; Comatula I l' 1 



^omasteridse; Comaster 1 22 



Jintacrinidse; Uintacrinus; the " interradial " and interbrachial plates are 



omitted so as to more clearly bring out the arms and pinnules L25 



^entacrinitidx; Endoxocrin us 126 



^entacrinitidiv; Isocrinus 126 



^entacrinitidse; Metacrinus 1 27 



iketch showing occurrence of geodes in Knobstone shales L36 



'osterior portion of carapace of Glyptops plicatulus Mil 



'ortion of carapace of Echmatemys rivalis I ('A 



'last ron of Echmatemys rivalis 166 



iide view of the Missouri skull 174 



. Left Bide of entire specimen of Leperditiafabulites. 2. Left valve of Isochilina '.' 

 subnodosa. 3. Right valve of Isochilina ? clavigera. 4. Left valve of Bey- 

 richia tuberculata. 5. Right valve of Beyrichia clavata Kolmodin. 6. Left 

 valve of Ctenobolbina alata Ulrich. 7. Left valve of Ctcnobolbina ciliata 

 (Emmons). 8. Beyrichia (Steusloffia) linnarssoni (Krause). Right valve. 

 9. Beyrichia salteriana Jones. 10. Different views of a left valve of Beyrichia 



tuberculata-buchiana Reuter 282 



!opy of McCoy's original sketches of Beyrichia kloedeni 283 



