28 Trans. Acad. Set. of St. Louis. 



1896. Rhoechinus hurlingtonensis. Jackson, Bull. Geol. Soc. 

 Amer., vol. 7, p. 203. 



Test spherical with four (?) columns of plates in each inter- 

 ambulacrum. Ambulacra narrow, composed of a double row 

 of alternating large and small pieces, twice or three times as 

 wide as long. Pores in a double zigzag row. Surface orna- 

 mentation small granules, from thirty to forty to each inter- 

 ambulacral plate. 



Geological formation and locality : Burlington Limestone, 

 Burlington, Iowa. 



2. Ehoechinus elegans M'Coy. 



1844. Palaechinus elegans. M'Coy, Foss. of Ireland, p. 



172, pi. 24, fig. 2. 

 1850. Palaechinus elegans. D'Orbigny, Prodrome, vol. 1, 



p. 154. 

 1852. Palaechinus elegans. Roemer, in Bronn's Leth. Geog. , 



Bd. 1, Th. 2, p. 287, tab. 4^, ^g. 1 a-d. 

 1858. Palaechinus elegans. Desor, Syn., p. 158. 

 1862. Palaechinus elegans. Dujardin et Hupe Echino- 



dermes, p. 463. 

 1865. Palaechinus elegans. Baily,Dub. Quart. Journ. Sci., 



vol. 5, p. 261, pi. 7. 

 1865. Palaechinus elegans. Baily, Geol. Mag., vol. 2, p. 44. 

 1865. Palaechinus elegans. Baily, Journ. Roy. Geol. Soc. 



Ireland, p. 63, pi. 4. 

 1874. Palaechinus elegans. Loven, Kongl. Svens. Vetens. 



Akad. Handl., Bd. 11, No. 7, p. 41. 



1874. Palaechinus elegant. Etheridge, Jr., Quart. Journ. 

 Geol. Soc. Lond., vol. 30, pi. 24. 



1875, Palaechinus elegans. Baily, Char. Brit. Foss., vol. 

 1, p. Lxviii., pi. 36, figs. 11 a^d. 



1875. Palaechinus elegans. Quenstedt, Petrefact. Deutschl., 



p. 380, tab. 75, fig. 43. 

 1889. Rhoechinus elegans. Duncan, Ann. Mag. Nat. Hist., 



ser. 6, vol. 3, p. 204. 

 1892. Palaechinus elegans. Agassiz A., Mem. Mus. Comp. 



Zool., vol. 17, no. 2, p. 73, pi. 29, ^g. 2. 



