Klem — Revision of the Palaeozoic Palae'echinoidea. 71 



1874. Eocidaris Verneuiliana, Loven, Kongl. Svens. Vet- 

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



Spines perforated and placed on elevated bases. Basal 

 ring crenulated radiately. Plates have a concave depression, 

 surrounded by an elliptical border of small tubercles in a 

 single series. Two kinds of spines known — one, muricated 

 and the other, striated longitudinally. 



Geological formation and locality: Shell-Limestone, 

 Tunstall Hill and Humble ton Quarry. 



UNDETERMINED OR INSUFFICIENTLY DETERMINED SPECIES. 



1. Eocidaris drydenensis Vanauxem. 



1842. Echinus drydenensis. Vanauxem, Kep. Third Geol. 



Dist., p. 184. 

 1867. Eocidaris Drydenensis, Hall, 20th Eep. State Cab. 



Nat. Hist. New York, p. 298. 

 1874. Eocidaris drydenensis, Loven, Kongl. Svens. Vetens. 



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

 1889. Eocidaris drydenensis. Miller, N. Amer. Geol. Pal., 



p. 242. 



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

 Sci., vol. 2, p. 184. 



1896. Archaeocidaris drydenensis, Jackson, Bull. Geol. Soc. 

 Amer., vol. 7, p. 214. 



Geological formation and locality: Devonian, Chemung 

 Sandstone, Dry den. New York. 



2. Eocidaris scrobiculata Sandberger. 



Cidaris scrobiculata, Sandberger, Verst. Rhein. 

 Schichtensy stems, p. 382, pi. 35, fig. 3. 

 1858. Eocidaris scrobiculata, Desor, Syn., p. 157, tab. 21, 



fig- 17. 

 1862. Eocidaris scrobiculata, Dujardin et Hupd, Echinoder- 



mes, p. 467. 



