PLATE XXX. 



PAGE. 

 Fig. 1. POTERIOCRIXUS CUI/TIDACTYLUS 301 



View of the anal side. 

 Fig. 2. TAXOCBINUS FLETCHERI 308 



View of a nearly perfect individual. 

 Fig. 3. ZEACBINUS PIKENSIS 304 



Side view of a nearly perfect individual. 

 Fig. 4. CYATHOCBINUS MABSHALLENSIS 310 



Side view of a nearly perfect individual. 

 Fig. 5. PETEBIOCKINUS RICHFIELDENSIS 285 



View of the anal side of the body and the arms complete. 



Fig, 6. POTEBIOCBINUS CLAYTONENSIS 288 



Bide view of the body with part of the arms and column. 

 Fig. 7. POTEBIOCBINUS TALBOTI 287 



Side view of the body and part of the arms. 

 Fig. 8. LECYTHIOCBINUS ADAMSI 317 



8 a, and 8 b. Opposite sides of the same specimen. 



8 c. View of the summit. 8 d. View of the base. 

 Fig. 9. PLATYCBINUS MONBOENSIS 306 



Side view of body and arms. 



Fig. 10. POTEBIOCBINUS CLYTIS 294 



Side view of a nearly perfect individual. 



Fig. 11. POTEKIOCBINUS FOUNTAINENSIS 286 



View of the anal side and part of the arms. 



Fig. 12. POTEBIOCEINUS SIMIUS 295 



Side view of a nearly perfect specimen. 



Fig. 13. ACBOCBINUS WOBTHENI 343 



13 a and 13 l>. Opposite sides of the body. 

 Fig. 14. ABCH.SEOCIDABIS SPINO-CLAVATUS 337 



14 a, b, c. Primary spines. 



14 d, e. Interambulacral plates. 



Fig. 15. ABCH^OCIDABIS EDGARENSIS 337 



15 a, b. Primary spines. 



15 c. Interambulacral plates. 



Fig. 16. JAW PLATES OF ABCH^OCIDABIS? sp. undt 



From the Upper Coal-Measures, LaSalle, 111. 



