202 CRINOIDS. 



Platycrinus boonvillensis Miller. 



Platycrinus boonvillensis Miller, 1891: Geol. Sur. Missouri, Bui. 4, p. S, 

 pi. i, figs. 7-8. 



Much like P. halli apparently, but with the radials some- 

 what wider than high. 



Horizon and locality. — Lower Carboniferous, Keokuk 

 limestone : Boonville. 



Platycrinus saffordi Troosf. 



Plate XXV, fig. 1. 



Platycrinus saffordi Troost, MS. 



Platycrinus saffordi Hall, 1858: Geol. Iowa, vol. I, p. 634, pi. xviii, figs. 

 5-6. 



Calyx of medium size, urn-shaped, truncated below ; basal 

 cup high, nearly one-half the height of the dorsal cup ; surface 

 smooth, with a row of prominent pustules bordering the 

 sutures on each plate, and on the radials running from the 

 lower corners to the arm bases; in this triangular space are 

 frequently several more or less distinct horizontal rows of 

 tubercles. Ventral side moderately elevated. 



Horizon and localities — Lower Carboniferous, Keokuk 

 limestone: Wayland ( Clark county ) ; Warsaw ( Illinois ). 



Platycrinus sarae Hall. 



Platycrinus sarce Hall, 1858: Geology Iowa, vol. I, p. 673, pi. xviii, fig. 4. 

 Platycrinus sarce Shumard, 1865: Trans. St. Louis Acad. Sci., vol. II, p. 

 390. 



Calyx subglobose ; surface smooth ; arms long, rather 

 slender, six to the ray. 



Horizon and localities — Lower Carboniferous, Saint Louis 

 limestone: Saint Louis. 



Eucladocrinus pleuroviminus (White). 



Platycrinus dlscoideus RSill, 1858: Geol. Iowa, vol. I, p. 535, pi. viii, figs. 



Sa-b (not Owen & Shumard, 1850). 

 Platycrinus pleuroviminus White, 1863: Proc. Boston Soc. Nat. Hist., vol. 



IX, p. 17. 

 Platycrinus {Eucladocrinus ) pleurovimi7ius Meek, 1870: Am. Jour. Sci. 

 Eucladocrinus pleuroviminus Wachsmuth & Springer, 1881 : Proc. Acad. Nat. 



Sci., Phila.,p. 251. 



