PLATE 14. 

 Archaeocidaris norwoodi Hall. Page 270. 



Fig. 1. Kaskaskia Group, Lower Carboniferous, Chester, Illinois (after Hall, 185S, I Mutt; 26, figs. 5b-5e), cotypeo. a, 

 adanibulacral plate enlarged; b, the saint; in profile; c, spine nearly twice enlarged; tl, base of same more enlarged; 

 spinules small, or large, directed distally. 



Archaeocidaris paradoxa (Kichwald). Page 270. 



Fig. 2. Upper Carboniferous, Sterlitamak and Saraninsk, Ural (after Eichwaltl, 18fi(), Plate 32, fig. 25), cotype. X 0.9. 

 Shaft of spine, spinules large, directed distally. 



Archaeocidaris mucronata Meek and Worthen. Page 271. 



Fig. 3. Chester Group, Lower Carboniferous, Liberty, Randolph County, Illinois (after Meek and Worthen, 1866, Plate 23, 



figs. 3a, 3c), holotype. X 0.9. a, hexagonal interambulacral plate from a median column; b, spine with large 



spinules directed distally. 

 Fig. 4. Upper Carboniferous, ten miles west of Ojo del Oso, near Fort Wingate, New Mexico (after White, 1877, Plate 6, 



fig. 7a, where it is referred to A. ornatus Newberry). U. S. Nat. Mus. Coll. 8,472. X 0.9. Distally and proximally 



restored as indicated by dotted lines. 



Archaeocidaris dininnii White. Page 271. 



Fig. 5. Upper Coal Measures, near Tenimsoh, Nebraska (after White, 1880a, Plate 35, figs. 6a, 6fc). U. S. Nat. Mus. 

 Coll. 8,031, cotypes. X 0.9. a, b, primary spines, with spinules at right angle to the axis. 



Archaeocidaris cratis White. Page 272. 



Fig. 6. Upper Carboniferous, confluence of Grand and Green Rivers, Utah (after Whitr, IssOa, Plate 33, fig. 2a, by error 

 given as White, 1880, on my p. 272). U. S. Nat. Mus. Coll., 8,235, holotype. X 0.9. Spinules sparse, but large, 

 directed distally. 



Archaeocidaris acanthifera Trautschold. Page 272. 



Fig. 7. Lower Carboniferous, Miatschkowa, near Moscow (after Trautschold, 1879, Plate 2, fig. In, the number is omitted 

 on the Plate, but occurs in the description of the same, by error given as Plate 2, fig. 1 u on my p. 272). Holo- 

 type. Spinules irregularly distributed, long. 



Fig. 8. Probably referable to this species. Carboniferous (Coal Measures), marine band, below the Gin-Mine coal, Nettle- 

 bank, North Staffordshire, England (after Hind, 1905. Plate 35, figs. 1, la, by error given as Plate 25 on my p. 272). 

 Natural size. Spinules long. 



Archaeocidaris biangulata Shumard and Swallow. Page 273. 



Fig. 9 Huerco Formation, Carboniferous (Coal Measures), Diablo Mountains, Western Texas. U. S. Nat. Mus. Coll. 

 X 2.8. a, adradial plate, basal terrace prominent; b, primary spine with serrate lateral flanges passing into spinules 

 which distally are generally distributed; c, similar, but flange more pronounced; d, flange still wider. 



Archaeocidaris ornata (Eichwald). Page 274. 



Fig. 10. Lower Carboniferous, Miatschkowa, near Moscow (after Eichwald, 1860, Plate 32, fig. 24). Holotype. Spine 

 densely covered with small spinules directed distally. 



Archaeocidaris ourayensis Girty. Page 274. 



Fig. 11. Hermosa Formation, Carboniferous (Coal Measures), Ouray, Colorado (after Girty, 1903, Plate 1. fig. 14). Holo- 

 type. U. S. Nat. Mus. Coll., 35,369. Somewhat enlarged. Spine densely covered with large spinules, directed 

 distally. 



Archaeocidaris triplex White. Page 274. 



Fig. 12. Carboniferous (Coal Measures; near Taos, New Mexico (after White, 1881, Plate 4, figs. 3a-3c), cotypes. U. S. 

 Nat. Mus. Coll. 9.^49. X 0.9. a, small interambulacral plate, "probably this species"; b, spine triangular in sec- 

 tion with spinules in three series, directed distally. White says this figure is restored from fragments; c, section 

 of spine. 



