448 ROBERT TRACY JACKSON ON ECHINI. 



shape of the spine and its weak annulus, this is apparently a secondary, not a primary spine. 

 Secondary spines, as far as known, are alike throughout the genus, and lack the diagnostic char- 

 acter of primary spines; therefore this species cannot be located in its relation to other species 

 of the genus, and is considered here. 



Lower Carboniferous, Assise de Lena: Ontoria, Sebarga, Spain. 



Archaeocidaris trautscholdi Toinquist. 

 Plate 15, fig. 14. 



Archarocidaris irautscholdi Tomquist, 1896, p. 29, Plate 4, fig. 1; Klem, 1904, p. 65. 

 Cidarotropus traiischoldi Lambert and Thiery, 1910, p. 125. 



Not recognizable. 



Lower Carboniferous, Miatschkowa, near Moscow, Russia. 



Archaeocidaris sp. Meek and Hayden. 

 Archaeocidaris sp. Meek anil Hayden, 1859, p. 25; Klem, 1904, p. 66. 

 Coal Measures, Cottonwood Creek, Kansas. 



Archaeocidaris sp. Meek and Hayden. 

 Archaeocidaris sp. Meek and Hayden, 1S59, p. 25; Klem, 1904, p. 66. 

 Coal Measures, Cottonwood Creek and Manhattan, Kansas. 



Archaeocidaris sp. Stache. 

 Archaeocidaris sp. Stache, 1877, p. 318, Plate 1, figs. 13-17; Klem, 1904, p. 66. 

 Bellerophonkalke, Lower Carboniferous, South Tyrol. 



Archaeocidaris (?) sp. Wm-then and Miller. 

 Archaeocidaris {?) sp. Worthen and Miller, 1883, Plate 30, figs. 16a-10c. 

 Good figures of pyramids of a lantern from the Upper Coal Measures of La Salle, Illinois 



Archaeocidaris sp. R. Etheridge, Jr. 

 Archaeocidaris sp. R. Etheridge, Jr., 1892, p. 213; 1892a, p. 67; Klem, 1904, p. 65. 



A single interambulacral plate is described as hexagonal with granular margins and 

 central, strong, well marked tubercle. Etheridge remarks that he believes that this is the first 

 announcement of the occurrence of the Palaeechinoida in the Australian Permo-Carboniferous 

 rocks. 



Gympie Beds, Permo-Carboniferous, Rockhampton District, Australia. 



