PLATE XVI. 



CODASTBB QRACILIS, Wacltsinittll , sp. 



Pig. 1. View of a radial sinus with the radio-deltoid sutures descending its walls and cross- 

 ing the hydrospire-slits. Upper Devonian, Michigan. Coll. P. II. Carpenter. 

 xG 83 



Cod.vsticr tbilobatus, vax. acutus, McCoy, var., p. 269. 



Fig. 2. Radial view of a sinus showing the radio-deltoid sutures, and three hvdrospire-slits 



on each side. Carboniferous Limestone, Lancashire and Yorkshire. x G. . 33 



Cetptoschisma Schulzi, d'Arch. Sf de rent., sp., p. 281. 

 Fig. 3. Internal view of a radial plate, showing the distal ends of the hydrospires. Lower 



Devonian, Leon. Coll. P. II. Carpenter. x 1 'JO 



Fig. 4. Sectional view of a fractured ambulacrum, showing the side plates resting over the 



tipper ends of the hydrospires. Lower Devonian, Leon. Coll. P. II. Carpenter. 



x4 <J 



Orophocrinus stelliformis, 0. fif S., sp., var. campanuxatus, Hambach, var., p. 289. 

 Fig. 5. Radial view of an example with a constricted basal cup. Subcarboniferous, 



Illinois. x 2 20 



Orophocrixtjs stelliformis, 0. § S., sp., p. 288. 



Fig. 6. Interior aspect of a radial plate exhibiting the distal ends of the hydrospires. Sub- 

 carboniferous, Illinois. Coll. Wachsmuth. x2 91 



Fig. 7. Radial view of a specimen in which the anchylosed top stem-joints are well seen. 



Subcarboniferous, Illinois. Coll. Wachsmuth. x li 19 



Orophocrinus pextaxgularis, Miller, sp., var. Waterhousiaxus, de Kon., var., p. 293. 

 Fig. 8. Anal interradius. Carboniferous Limestone, Belgium. Natural size . ... 16 

 Fig. 9. Base of the same, showing an interpolation of additional plates arising from repair 



to an injury. Natural size 293 



Orophocrinus vercs, Cumberland, sp., p. 290. 

 Fig. 10. An almost complete anal aperture. Carboniferous Limestone, Lancashire. x 4 28G 



Pextremitidea Roemeri, E. iV C. 

 Fig. 11. Radial view of an almost complete specimen. Middle Devonian, Eifel. Coll. F. 



Roemer. x4 173 



ScHIZOBLASTUS BaILII, E. § C. 



Pig. 12. Summit view, showing the double spiracles. Carboniferous Limestone, Ireland. 



Coll. Geological Survey of Ireland. x2 Ill 



Fig. 13. Radial view of the same specimen. x2 221 



