60 Trans. Acad. Sci. of St. Louis. 



1850. Echinocrinus Urii. D'Orbigny, Prodrome, vol. 1, 



p. 154. 

 1852. Archaeocidaris Urii. Roerner, Leth. Geog., Bel. 1, 



Th. 2, p. 288, taf. 4 1 , fig. 2. 

 1854. Archaeocidaris Urii. Morris, Cat. Brit. Foss., p. 72. 

 1858. Archaeocidaris Urii. Desor, Syn., p. 154, tab. 21, 



figs. 11, 12. 

 1862. Archaeocidaris Urii. Dujardin et Hupe, Echinoder- 



rnes, p. 465. 

 1874. Archaeocidaris Urii. Julien, Compt. Rend. Acad. 



Sci. Paris, T. 78, p. 76. 



1874. Archaeocidaris Urei. Loven, Konsd. Svens. Vetens. 

 Akad. Handl., Bd. 11, no. 7, p. 43. 



1875. Archaeocideris Urii. Baily, Char. Brit. Foss., p. 

 lxviii, pi. 36, figs. 12 a, b. 



1876. Archaeocidaris Urii. Keeping, Quart. Journ. Geol. 

 Soc. Lond., vol. 32, pt. 1, p. 39, pi. 3, figs. 14-18. 



1890. Archaeocidaris Urii. Julien, Compt. Rend. Acad. 



Sci. Paris, T. 110, p. 737. 

 1893. Archaeocidaris Urii. Tornquist,Mitth. Geol. Landes- 



Anst. Elsass-Lothr., Bd. 4, lift. 2, p. 102. 



1895. Archaeocidaris urei. Neilson, Trans. Geol. Soc. 

 Glasgow, vol. 10, p. 77, fig. 3. 



1896. Archaeocidaris Urii. Julien, Terr. Carb. Marin de 

 la France Centrale, p. 123. 



1897. Archaeocidaris Urii. Tornquist, Abhdl. Geol. Karte 

 Elsass-Lothr. Bd. 5, hft. 6, p. 775, taf. 22, figs. 4, 5, 

 6, 7, 11. 



1898. Archaeocidaris urei. Thomson, Trans. Geol. Soc- 

 Glasgow, vol. 11, p. 24, 26, 30. 



Ring at the base of the primary tubercle very distinct. 

 Edges of the plates bearing tubercles ornamented with radi- 

 ating ridges. 



Primary spines long, finely striated about one-third of the 

 way, the upper part ornamented by five or six ranges of lon- 

 gitudinal alternating rows of short stout spines. 



Geological formation and locality: Carboniferous Lime- 

 stone, Townparks Killeshandra; Lough Esk, Donegal; Ra- 



