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



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



p. 154. 

 1852. Archaeocidaris Urii. Roemer, Leth. Geog., Bd. 1, 



Th. 2, p. 288, taf. 4i, 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- 



raes, p. 465. 

 1874. Archaeocida7'is Urii. Julieu, Compt. Rend. Acad. 



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



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

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



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

 lxviii,pl. 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, hft. 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. Archaeocidar'is Urii. Tornquist, Abhdl. Geol. Karte 

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

 6, 7, 11. 



1898. Ar'chaeocidaris 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 ^ve 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- 



