PLATE XI. 



I'll BNOSCHI8MA xor.ll.l :, E. 8f C, p. 275. 



Fig. 1. Interradia] view of a large specimen, broken below. Lower Devonian, Leon. 



x 1 i . 30 



Fig. 2. Similar view of the upper part of another specimen, with the outer edges of the 



sinuses crushed inwards. x 1£ 89 



Fig. 3. Summit view of the same specimen, showing the wide sinuses, the aarrow Linear 



ambulacra, and the radio-deltoid sutures crossing the numerous hydrospire- 



slits. x H 80 



Fig. 4. Portion of a radial sinus, to show the narrow ambulacrum and the lancet-plate 



uncovered at its distal end, and also the arrangement of the hydrospire-slits. 



x4 00 



l'u i '.xosciiisma Yerxeuili, E. § C, p. 273. 



Fig. 5. Iuterradial view, to show the high inwardly sloping interradia] processes. Lower 



Devonian, Asturias. xl| 89 



Fig. 6. View of the anal iuterradius, with less elevated processes, &c. Coll. P. II. Carpenter. 



x 2 33 



Ph.exosciiisma Archiaci, E. fy C, p. 274. 



Fig. 7. Section of a calyx from above, showing the thickened plates and the groups of 

 hydrospires. The few hydrospires in the posterior iuterradius arc not seen. 

 (Compare PI. XIV. fig. 5.) Lower Devonian, Asturias. x (3 :27~> 



Orophocrixus stelliformis, 0. i)- S., sp., p. 287. 



Fig. 8. A radial sinus with the ambulacrum partly preserved. The lancet-plate is exposed 

 in the middle line ; ou the left is visible the deeper portion of the hydros pire- 

 cleft, whilst on the right there are more of the side plates iu position, so as to 

 form the outer opening of the hydrospire-cleft or spiracle. Subcarboniferous, 

 Iowa. Coll. Wachsmuth. x 4 99 



Fig. 9. Summit view of a variety of this species. Subcarboniferous, Iowa. Coll. Wachs- 

 muth. x 3 99 



Orophocrinus Orbig.xyaxus, de Kon., sp. 

 Fig. 10. A radial sinus, with a portion of the ambulacrum in situ. Iu the middle line the 

 lancet-plate is exposed; on the right the side plates are partially removed and 

 the hydrospire-clefts visible ; on the left the side plates are in place, and the 

 large pinnule-sockets are well seen. Carbouiferous Limestone, Belgium. Coll. 

 University of Liege. x 10 90 



Graxatocrixus Derbiexsis, G. B. Sby., sp., p. 250. 



Kg. 11. Portion of a radial sinus with the lancet-plate in situ, but denuded of the side 

 plates. The hydrospire-pores are visible at its sides. Carboniferous Limestone, 

 Lancashire. x G 92 



