Klem — Revision of the Palaeozoic Palae'echinoidea. 53 



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



p. 154. 

 1854. Palaeocidaris Nerei. Vogt, Lehrbuch d. Geol. u. 



Petref., Aufl. 2, Bd. 1, p. 314. 

 1858. Archaeocidaris Nerei. Desor, Syn., p. 154, tub. 1, 



fig. 6. 

 1862. Archaeocidaris Nerei. Dujardin et Hupc, Echinoder- 



mes, p. 465. 

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



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



1896. Archaeocidaris Nerei. Julien, Terr. Carb. de la 

 France Centrale, p. 126, pi. 6, figs. 6, 7. 



1897. Archaeocidaris Nerei. Leyh, Zeitsch. Deut. Geol. 

 Gesell., Bd. 49, p. 540. 



Ring around each primary tubercle very marked. Scrobi- 

 cule surrounded by a circle of small radiating ridges instead 

 of granules. Spines cylindrical, sometimes striated, some- 

 times finely spinous with a tendency to branch near the apex. 



Geological formation and locality : Carboniferous, Reguitz- 

 losau and Tournay, Belgium ; La Varville and Siguret, 

 France. 



15. Archaeocidaris newberryi Hambach. 



1884. Archaeocidaris newberryi. Hambach, Trans. St. Louis 

 Acad. Sci., vol. 4, p. 551, pi. D, fig. 1. 



1889. Archaeocidaris newberryi. Miller, N. Amer. Geol. 

 Pal., p. 225. 



1894. Archaeocidaris newberryi. Keyes, Mo. Geol. Surv., 

 vol. 4, p. 129. 



1895. Archaeocidaris newberryi. Keyes, Proc. Iowa Acad. 

 Sci., vol. 2, p. 187. 



Primary tubercle papilliform with a double annulation, 

 and a ring of granules beyond. Spines elongate, slightly 

 compressed toward the summit and bent just above the cren- 

 ulated annulation. Surface of the spines finely striated and 

 ornamented with small ascending spinules. 



Geological formation and locality: St. Louis Limestone, 

 St. Louis, Mo. 



