2 



OROPHOCRINUS STELL1FORMIS, 0. if S.. Sp., p. 287. 



Page 



Fig. 12. A similar section which seems to show traces of the grooved under lancet-plate. 

 The five slits on each side pierce the radial plates. Sub-carboniferous, Iowa. 

 x8 91 



Orophocrintjs verus, Cumb,, sp., p. 290. 

 Fig. 13. A similar section, with the side plates in position, the lancet-canal very large, and 



seven hydrospire-tubes on each side. Carboniferous Limestone, Lancashire . 46 



Orophocrinus pentangularis, Miller, sp., p. 292. 

 Fig. 14. A similar sectio'n, the lancet-plate large and deep, eight hydrospire-tubes on each 



side. Carboniferous Limestone, Lancashire. x 6 90 



Phjenoschisma Archiaci, E. £>- C, p. 274. 



Fig. 15. Cross section of two ambulacral fields; the hydrospires are eight in number on 

 each side of an ambulacrum, and are largely excavated in the radial plates. 

 Lower Devonian, Asturias. x 6 89 



Ph.enoschisma caryophyllatum, de Koninck, sp., p. 277. 

 Fig. 16. Cross section of one ambulacrum, and portions of two others, with five hydrospire- 

 tubes on each side. The large side plates are well shown. Carboniferous 

 Limestone, Belgium. x 6 89 



Troostocrinus Reinwardti, Troost, sp., p. 194. 

 Fig. 17. Cross section of an ambulacrum, with the lancet-plate somewhat depressed in the 

 sinus, and three hydrospire-tubes on each side. Niagara Group, Tennessee, 

 x 14 94 



Metablastus lineatus, Shumard, sp., p. 199. 

 Fig. 18. A similar section, the laucet-plate much depressed in the deep sinus, and triply 

 perforate, with four hydrospire-tubes on each side. Subcarboniferous, Iowa. 

 Coll. Wachsmuth. x6 54 



El.eacrixus Verneuili, Troost, sp., p. 216. 

 Fig. 19. A similar section, with two hydrospire-tubes on each side. Cornifcrous Limestone, 



Kentucky. x8 215 



