Klem — Revision of the Palaeozoic Palaeechiiioidea. 55 



1903. Archaeocidaris omata. Girty,U. S. Geol. Surv. Pro- 

 fessional Paper No. 16, p. 331. 



Primary spines fusiform and strong. For a short dis- 

 tance above the basal ring the, surface is plain or not conspic- 

 uously marked. Above this it is thickly set with spinules 

 arranged in an imperfect spiral line. Basal rings rather large 

 with crenulated border. 



Geological formation and locality: Upper Carboniferous 

 Limestone, Banks of the Colorado River; Ojo del Oso, near 

 Fort Wingate, New Mexico; San Juan region, Leadville dis- 

 trict, Colo. 



18. Archaeocidaris rossicus von Buch. 



1842. Cidaris Rossicus. von Buch, Karsten's Archiv, Bd. 



16, p. 523. 

 1845. Oidarites Rossicus. Murchison, Verneuil, Keyserling, 



Geol. Russ. d'Europe, vol. 2, p. 16, 396, pi. 1, figs. 



2 a-e. 

 1847. Palaeocidaris Rossica. Desor et Agassiz, Cat. Rais., 



p. 36. 

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



p. 154. 

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



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

 1858. Eocidaris Rossica. Desor, Syn., p. 156, pi. 21, figs. 



3-6. 

 1860. Echinocrinus Duecalionis. Eichwald, Leth. Ross., T. 



1, p. 652. 

 1860. Echinocrinus ornaius. Eichwald, Leth. Ross., T. 1, p. 



654, tab. 32, fig. 24. 

 1862. Eocidaris rossica. Dujardin et Hupe, Echinodermes, 



p. 467. 

 1866. Eocidaris Rossicus. Geinitz, Carb.u. Dyas in Nebr., 



p. 61. 

 1868. Archaeocidaris rossicus. Trautschold, Bull. Soc. Nat. 



Moscou, vol. 41, p. 467, pi. 9. 

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



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



